[Docs] 1.81.9 stability (#20665)

* docs * review 1 * docs fix
2026-08-14 10:25:37 +00:00 · 2026-02-07 13:15:23 -08:00
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+---
+title: "v1.81.9 - Claude Opus 4.6, A2A Agent Gateway, MCP Semantic Filtering & IP Controls"
+slug: "v1-81-9"
+date: 2026-02-07T00:00:00
+authors:
+  - name: Krrish Dholakia
+    title: CEO, LiteLLM
+    url: https://www.linkedin.com/in/krish-d/
+    image_url: https://pbs.twimg.com/profile_images/1298587542745358340/DZv3Oj-h_400x400.jpg
+  - name: Ishaan Jaff
+    title: CTO, LiteLLM
+    url: https://www.linkedin.com/in/reffajnaahsi/
+    image_url: https://pbs.twimg.com/profile_images/1613813310264340481/lz54oEiB_400x400.jpg
+hide_table_of_contents: false
+---
+
+## Deploy this version
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+import Image from '@theme/IdealImage';
+
+<Tabs>
+<TabItem value="docker" label="Docker">
+
+``` showLineNumbers title="docker run litellm"
+docker run \
+-e STORE_MODEL_IN_DB=True \
+-p 4000:4000 \
+docker.litellm.ai/berriai/litellm:main-v1.81.9
+```
+
+</TabItem>
+<TabItem value="pip" label="Pip">
+
+``` showLineNumbers title="pip install litellm"
+pip install litellm==1.81.9
+```
+
+</TabItem>
+</Tabs>
+
+## Key Highlights
+
+- **Claude Opus 4.6** - Full support across Anthropic, AWS Bedrock, Azure AI, and Vertex AI with adaptive thinking and 1M context window
+- **A2A Agent Gateway** - Call A2A (Agent-to-Agent) registered agents through the standard `/chat/completions` API
+- **Expose MCP servers on the public internet** - Launch MCP servers with public/private visibility and IP-based access control for internet-facing deployments
+- **Performance Optimizations** - Multiple performance improvements including ~40% Prometheus CPU reduction, LRU caching, and optimized logging paths
+
+---
+
+## MCP Servers on the Public Internet
+
+This release makes it safe to expose MCP servers on the public internet by adding public/private visibility and IP-based access control. You can now run internet-facing MCP services while restricting access to trusted networks and keeping internal tools private.
+
+[Get started](../../docs/mcp_public_internet)
+
+{/* TODO: Add screenshot - save as mcp_public_internet.png */}
+{/* <Image img={require('../../img/mcp_public_internet.png')} style={{ maxWidth: '900px', width: '100%' }} /> */}
+
+Let's dive in.
+
+---
+
+## New Models / Updated Models
+
+#### New Model Support (13 new models)
+
+| Provider | Model | Context Window | Input ($/1M tokens) | Output ($/1M tokens) | Features |
+| -------- | ----- | -------------- | ------------------- | -------------------- | -------- |
+| Anthropic | `claude-opus-4-6` | 1M | $5.00 | $25.00 | Chat, vision, reasoning, function calling, computer use, PDF, prompt caching |
+| AWS Bedrock | `anthropic.claude-opus-4-6-v1` | 1M | $5.00 | $25.00 | Chat, vision, reasoning, function calling, computer use, PDF, prompt caching |
+| Azure AI | `azure_ai/claude-opus-4-6` | 200K | $5.00 | $25.00 | Chat, vision, reasoning, function calling, computer use, PDF, prompt caching |
+| Vertex AI | `vertex_ai/claude-opus-4-6` | 1M | $5.00 | $25.00 | Chat, vision, reasoning, function calling, computer use, PDF, prompt caching |
+| Google Gemini | `gemini/deep-research-pro-preview-12-2025` | 65K | $2.00 | $12.00 | Deep research |
+| Vertex AI | `vertex_ai/deep-research-pro-preview-12-2025` | 65K | $2.00 | $12.00 | Deep research |
+| Moonshot | `moonshot/kimi-k2.5` | 262K | $0.60 | $3.00 | Chat, vision, function calling |
+| OpenRouter | `openrouter/qwen/qwen3-235b-a22b-2507` | 262K | $0.07 | $0.10 | Chat, function calling |
+| OpenRouter | `openrouter/qwen/qwen3-235b-a22b-thinking-2507` | 262K | $0.11 | $0.60 | Chat, function calling, reasoning |
+| Together AI | `together_ai/zai-org/GLM-4.7` | 200K | $0.45 | $2.00 | Chat, function calling, reasoning |
+| Together AI | `together_ai/moonshotai/Kimi-K2.5` | 256K | $0.50 | $2.80 | Chat, vision, function calling, reasoning |
+| ElevenLabs | `elevenlabs/eleven_v3` | - | $0.18/1K chars | - | Text-to-speech, 70+ languages |
+| ElevenLabs | `elevenlabs/eleven_multilingual_v2` | - | $0.18/1K chars | - | Text-to-speech, 29 languages |
+
+#### Features
+
+- **[Anthropic](../../docs/providers/anthropic)**
+    - Full Claude Opus 4.6 support with adaptive thinking across all regions (us, eu, apac, au) - [PR #20506](https://github.com/BerriAI/litellm/pull/20506), [PR #20508](https://github.com/BerriAI/litellm/pull/20508), [PR #20514](https://github.com/BerriAI/litellm/pull/20514), [PR #20551](https://github.com/BerriAI/litellm/pull/20551)
+    - Add unsupported claude code beta headers filtering - [PR #20578](https://github.com/BerriAI/litellm/pull/20578)
+    - Map reasoning content to anthropic thinking block (streaming + non-streaming) - [PR #20254](https://github.com/BerriAI/litellm/pull/20254)
+    - Fix inconsistent response format in `anthropic.messages.acreate()` when using non-Anthropic providers - [PR #20442](https://github.com/BerriAI/litellm/pull/20442)
+
+- **[AWS Bedrock](../../docs/providers/bedrock)**
+    - Add 1hr tiered caching costs for long-context models - [PR #20214](https://github.com/BerriAI/litellm/pull/20214)
+    - Support TTL (1h) field in prompt caching for Bedrock Claude 4.5 models - [PR #20338](https://github.com/BerriAI/litellm/pull/20338)
+    - Add Nova Sonic speech-to-speech model support - [PR #20244](https://github.com/BerriAI/litellm/pull/20244)
+    - Fix empty assistant message for Converse API - [PR #20390](https://github.com/BerriAI/litellm/pull/20390)
+    - Fix content blocked handling - [PR #20606](https://github.com/BerriAI/litellm/pull/20606)
+
+- **[Google Gemini / Vertex AI](../../docs/providers/gemini)**
+    - Add Gemini Deep Research model support - [PR #20406](https://github.com/BerriAI/litellm/pull/20406)
+    - Fix Vertex AI Gemini streaming content_filter handling - [PR #20105](https://github.com/BerriAI/litellm/pull/20105)
+    - Allow using OpenAI-style tools for `web_search` with Vertex AI/Gemini models - [PR #20280](https://github.com/BerriAI/litellm/pull/20280)
+    - Fix `supports_native_streaming` for Gemini and Vertex AI models - [PR #20408](https://github.com/BerriAI/litellm/pull/20408)
+    - Add mapping for responses tools in file IDs - [PR #20402](https://github.com/BerriAI/litellm/pull/20402)
+
+- **[Cohere](../../docs/providers/cohere)**
+    - Support `dimensions` param for Cohere embed v4 - [PR #20235](https://github.com/BerriAI/litellm/pull/20235)
+
+- **[Cerebras](../../docs/providers/cerebras)**
+    - Add reasoning param support for GPT OSS Cerebras - [PR #20258](https://github.com/BerriAI/litellm/pull/20258)
+
+- **[Moonshot](../../docs/providers/moonshot)**
+    - Add Kimi K2.5 model entries - [PR #20273](https://github.com/BerriAI/litellm/pull/20273)
+
+- **[OpenRouter](../../docs/providers/openrouter)**
+    - Add Qwen3-235B models - [PR #20455](https://github.com/BerriAI/litellm/pull/20455)
+
+- **[Together AI](../../docs/providers/togetherai)**
+    - Add GLM-4.7 and Kimi-K2.5 models - [PR #20319](https://github.com/BerriAI/litellm/pull/20319)
+
+- **[ElevenLabs](../../docs/providers/elevenlabs)**
+    - Add `eleven_v3` and `eleven_multilingual_v2` TTS models - [PR #20522](https://github.com/BerriAI/litellm/pull/20522)
+
+- **[Vercel AI Gateway](../../docs/providers/vercel_ai_gateway)**
+    - Add missing capability flags to models - [PR #20276](https://github.com/BerriAI/litellm/pull/20276)
+
+- **[GitHub Copilot](../../docs/providers/github_copilot)**
+    - Fix system prompts being dropped and auto-add required Copilot headers - [PR #20113](https://github.com/BerriAI/litellm/pull/20113)
+
+- **[GigaChat](../../docs/providers/gigachat)**
+    - Fix incorrect merging of consecutive user messages for GigaChat provider - [PR #20341](https://github.com/BerriAI/litellm/pull/20341)
+
+- **[xAI](../../docs/providers/xai_realtime)**
+    - Add xAI `/realtime` API support - works with LiveKit SDK - [PR #20381](https://github.com/BerriAI/litellm/pull/20381)
+
+- **[OpenAI](../../docs/providers/openai)**
+    - Add `gpt-5-search-api` model and docs clarifications - [PR #20512](https://github.com/BerriAI/litellm/pull/20512)
+
+### Bug Fixes
+
+- **[Anthropic](../../docs/providers/anthropic)**
+    - Fix extra inputs not permitted error for `provider_specific_fields` - [PR #20334](https://github.com/BerriAI/litellm/pull/20334)
+
+- **[AWS Bedrock](../../docs/providers/bedrock)**
+    - Fix: Managed Batches inconsistent state management for list and cancel batches - [PR #20331](https://github.com/BerriAI/litellm/pull/20331)
+
+- **[OpenAI Embeddings](../../docs/providers/openai)**
+    - Fix `open_ai_embedding_models` to have `custom_llm_provider` None - [PR #20253](https://github.com/BerriAI/litellm/pull/20253)
+
+---
+
+## LLM API Endpoints (2 new endpoints)
+
+#### Features
+
+| Endpoint | Method | Description | Documentation |
+| -------- | ------ | ----------- | ------------- |
+| `/chat/completions` | POST | A2A agent invocation via standard completions API | [Docs](../../docs/a2a) |
+| `/files` | GET/DELETE | Gemini file retrieval and deletion by `file_id` | [Docs](../../docs/providers/gemini) |
+
+- **[A2A Agent Gateway](../../docs/a2a)**
+    - Allow calling A2A agents through LiteLLM `/chat/completions` API - [PR #20358](https://github.com/BerriAI/litellm/pull/20358)
+    - Use A2A registered agents with `/chat/completions` - [PR #20362](https://github.com/BerriAI/litellm/pull/20362)
+    - Fix A2A agents deployed with localhost/internal URLs in their agent cards - [PR #20604](https://github.com/BerriAI/litellm/pull/20604)
+
+- **[Files API](../../docs/providers/gemini)**
+    - Add support for delete and GET via file_id for Gemini - [PR #20329](https://github.com/BerriAI/litellm/pull/20329)
+
+- **General**
+    - Add User-Agent customization support - [PR #19881](https://github.com/BerriAI/litellm/pull/19881)
+    - Fix search tools not found when using per-request routers - [PR #19818](https://github.com/BerriAI/litellm/pull/19818)
+    - Forward extra headers in chat - [PR #20386](https://github.com/BerriAI/litellm/pull/20386)
+
+---
+
+## Management Endpoints / UI
+
+#### Features
+
+- **SSO Configuration**
+    - SSO Config Team Mappings - [PR #20111](https://github.com/BerriAI/litellm/pull/20111)
+    - UI - SSO: Add Team Mappings - [PR #20299](https://github.com/BerriAI/litellm/pull/20299)
+    - Extract user roles from JWT access token for Keycloak compatibility - [PR #20591](https://github.com/BerriAI/litellm/pull/20591)
+
+- **Auth / SDK**
+    - Add `proxy_auth` for auto OAuth2/JWT token management in SDK - [PR #20238](https://github.com/BerriAI/litellm/pull/20238)
+
+- **Virtual Keys**
+    - Key `reset_spend` endpoint - [PR #20305](https://github.com/BerriAI/litellm/pull/20305)
+    - UI - Keys: Allowed Routes to Key Info and Edit Pages - [PR #20369](https://github.com/BerriAI/litellm/pull/20369)
+    - Add Key info endpoint object permission data - [PR #20407](https://github.com/BerriAI/litellm/pull/20407)
+    - Keys and Teams Router Setting + Allow Override of Router Settings - [PR #20205](https://github.com/BerriAI/litellm/pull/20205)
+
+- **Teams & Budgets**
+    - Add `soft_budget` to Team Table + Create/Update Endpoints - [PR #20530](https://github.com/BerriAI/litellm/pull/20530)
+    - Team Soft Budget Email Alerts - [PR #20553](https://github.com/BerriAI/litellm/pull/20553)
+    - UI - Team Settings: Soft Budget + Alerting Emails - [PR #20634](https://github.com/BerriAI/litellm/pull/20634)
+    - UI - User Budget Page: Unlimited Budget Checkbox - [PR #20380](https://github.com/BerriAI/litellm/pull/20380)
+    - `/user/update` allow for `max_budget` resets - [PR #20375](https://github.com/BerriAI/litellm/pull/20375)
+
+- **UI Improvements**
+    - Default Team Settings: Migrate to use Reusable Model Select - [PR #20310](https://github.com/BerriAI/litellm/pull/20310)
+    - Navbar: Option to Hide Community Engagement Buttons - [PR #20308](https://github.com/BerriAI/litellm/pull/20308)
+    - Show team alias on Models health page - [PR #20359](https://github.com/BerriAI/litellm/pull/20359)
+    - Admin Settings: Add option for Authentication for public AI Hub - [PR #20444](https://github.com/BerriAI/litellm/pull/20444)
+    - Adjust daily spend date filtering for user timezone - [PR #20472](https://github.com/BerriAI/litellm/pull/20472)
+
+- **SCIM**
+    - Add base `/scim/v2` endpoint for SCIM resource discovery - [PR #20301](https://github.com/BerriAI/litellm/pull/20301)
+
+- **Proxy CLI**
+    - CLI arguments for RDS IAM auth - [PR #20437](https://github.com/BerriAI/litellm/pull/20437)
+
+#### Bugs
+
+- Fix: Remove unnecessary key blocking on UI login that prevented access - [PR #20210](https://github.com/BerriAI/litellm/pull/20210)
+- UI - Team Settings: Disable Global Guardrail Persistence - [PR #20307](https://github.com/BerriAI/litellm/pull/20307)
+- UI - Model Info Page: Fix Input and Output Labels - [PR #20462](https://github.com/BerriAI/litellm/pull/20462)
+- UI - Model Page: Column Resizing on Smaller Screens - [PR #20599](https://github.com/BerriAI/litellm/pull/20599)
+- Fix `/key/list` `user_id` Empty String Edge Case - [PR #20623](https://github.com/BerriAI/litellm/pull/20623)
+- Add array type checks for model, agent, and MCP hub data to prevent UI crashes - [PR #20469](https://github.com/BerriAI/litellm/pull/20469)
+- Fix unique constraint on daily tables + logging when updates fail - [PR #20394](https://github.com/BerriAI/litellm/pull/20394)
+- Fix 404 Not Found on `/api/event_logging/batch` endpoint - [PR #20504](https://github.com/BerriAI/litellm/pull/20504)
+
+---
+
+## Logging / Guardrail / Prompt Management Integrations
+
+#### Bug Fixes (3 fixes)
+
+- **[Langfuse](../../docs/proxy/logging#langfuse)**
+    - Fix Langfuse OTEL trace export failing when spans contain null attributes - [PR #20382](https://github.com/BerriAI/litellm/pull/20382)
+
+- **[Prometheus](../../docs/proxy/logging#prometheus)**
+    - Fix incorrect failure metrics labels causing miscounted error rates - [PR #20152](https://github.com/BerriAI/litellm/pull/20152)
+
+- **[Slack Alerts](../../docs/proxy/alerting)**
+    - Fix Slack alert delivery failing for certain budget threshold configurations - [PR #20257](https://github.com/BerriAI/litellm/pull/20257)
+
+#### Guardrails (7 updates)
+
+- **Custom Code Guardrails**
+    - Add HTTP support to custom code guardrails + Unified guardrails for MCP + Agent guardrail support - [PR #20619](https://github.com/BerriAI/litellm/pull/20619)
+    - Custom Code Guardrails UI Playground - [PR #20377](https://github.com/BerriAI/litellm/pull/20377)
+
+- **Team-Based Guardrails**
+    - Implement team-based isolation guardrails management - [PR #20318](https://github.com/BerriAI/litellm/pull/20318)
+
+- **[OpenAI Moderations](../../docs/apply_guardrail)**
+    - Ensure OpenAI Moderations Guard works with OpenAI Embeddings - [PR #20523](https://github.com/BerriAI/litellm/pull/20523)
+
+- **[GraySwan / Cygnal](../../docs/apply_guardrail)**
+    - Fix fail-open for GraySwan and pass metadata to Cygnal API endpoint - [PR #19837](https://github.com/BerriAI/litellm/pull/19837)
+
+- **General**
+    - Check for `model_response_choices` before guardrail input - [PR #19784](https://github.com/BerriAI/litellm/pull/19784)
+    - Preserve streaming content on guardrail-sampled chunks - [PR #20027](https://github.com/BerriAI/litellm/pull/20027)
+
+---
+
+## Spend Tracking, Budgets and Rate Limiting
+
+- **Support 0 cost models** - Allow zero-cost model entries for internal/free-tier models - [PR #20249](https://github.com/BerriAI/litellm/pull/20249)
+
+---
+
+## MCP Gateway (9 updates)
+
+- **MCP Semantic Filtering** - Filter MCP tools using semantic similarity to reduce tool sprawl for LLM calls - [PR #20296](https://github.com/BerriAI/litellm/pull/20296), [PR #20316](https://github.com/BerriAI/litellm/pull/20316)
+- **UI - MCP Semantic Filtering** - Add support for MCP Semantic Filtering configuration on UI - [PR #20454](https://github.com/BerriAI/litellm/pull/20454)
+- **MCP IP-Based Access Control** - Set MCP servers as private/public available on internet with IP-based restrictions - [PR #20607](https://github.com/BerriAI/litellm/pull/20607), [PR #20620](https://github.com/BerriAI/litellm/pull/20620)
+- **Fix MCP "Session not found" error** on VSCode reconnect - [PR #20298](https://github.com/BerriAI/litellm/pull/20298)
+- **Fix OAuth2 'Capabilities: none' bug** for upstream MCP servers - [PR #20602](https://github.com/BerriAI/litellm/pull/20602)
+- **Include Config Defined Search Tools** in `/search_tools/list` - [PR #20371](https://github.com/BerriAI/litellm/pull/20371)
+- **UI - Search Tools**: Show Config Defined Search Tools - [PR #20436](https://github.com/BerriAI/litellm/pull/20436)
+- **Ensure MCP permissions are enforced** when using JWT Auth - [PR #20383](https://github.com/BerriAI/litellm/pull/20383)
+- **Fix `gcs_bucket_name` not being passed** correctly for MCP server storage configuration - [PR #20491](https://github.com/BerriAI/litellm/pull/20491)
+
+---
+
+## Performance / Loadbalancing / Reliability improvements (14 improvements)
+
+- **Prometheus ~40% CPU reduction** - Parallelize budget metrics, fix caching bug, reduce CPU usage - [PR #20544](https://github.com/BerriAI/litellm/pull/20544)
+- **Prevent closed client errors** by reverting httpx client caching - [PR #20025](https://github.com/BerriAI/litellm/pull/20025)
+- **Avoid unnecessary Router creation** when no models or search tools are configured - [PR #20661](https://github.com/BerriAI/litellm/pull/20661)
+- **Optimize `wrapper_async`** with `CallTypes` caching and reduced lookups - [PR #20204](https://github.com/BerriAI/litellm/pull/20204)
+- **Cache `_get_relevant_args_to_use_for_logging()`** at module level - [PR #20077](https://github.com/BerriAI/litellm/pull/20077)
+- **LRU cache for `normalize_request_route`** - [PR #19812](https://github.com/BerriAI/litellm/pull/19812)
+- **Optimize `get_standard_logging_metadata`** with set intersection - [PR #19685](https://github.com/BerriAI/litellm/pull/19685)
+- **Early-exit guards in `completion_cost`** for unused features - [PR #20020](https://github.com/BerriAI/litellm/pull/20020)
+- **Optimize `get_litellm_params`** with sparse kwargs extraction - [PR #19884](https://github.com/BerriAI/litellm/pull/19884)
+- **Guard debug log f-strings** and remove redundant dict copies - [PR #19961](https://github.com/BerriAI/litellm/pull/19961)
+- **Replace enum construction with frozenset lookup** - [PR #20302](https://github.com/BerriAI/litellm/pull/20302)
+- **Guard debug f-string in `update_environment_variables`** - [PR #20360](https://github.com/BerriAI/litellm/pull/20360)
+- **Warn when budget lookup fails** to surface silent caching misses - [PR #20545](https://github.com/BerriAI/litellm/pull/20545)
+- **Add INFO-level session reuse logging** per request for better observability - [PR #20597](https://github.com/BerriAI/litellm/pull/20597)
+
+---
+
+## Database Changes
+
+### Schema Updates
+
+| Table | Change Type | Description | PR | Migration |
+| ----- | ----------- | ----------- | -- | --------- |
+| `LiteLLM_TeamTable` | New Column | Added `allow_team_guardrail_config` boolean field for team-based guardrail isolation | [PR #20318](https://github.com/BerriAI/litellm/pull/20318) | [Migration](https://github.com/BerriAI/litellm/blob/main/litellm-proxy-extras/litellm_proxy_extras/migrations/20260205091235_allow_team_guardrail_config/migration.sql) |
+| `LiteLLM_DeletedTeamTable` | New Column | Added `allow_team_guardrail_config` boolean field | [PR #20318](https://github.com/BerriAI/litellm/pull/20318) | [Migration](https://github.com/BerriAI/litellm/blob/main/litellm-proxy-extras/litellm_proxy_extras/migrations/20260205091235_allow_team_guardrail_config/migration.sql) |
+| `LiteLLM_TeamTable` | New Column | Added `soft_budget` (double precision) for soft budget alerting | [PR #20530](https://github.com/BerriAI/litellm/pull/20530) | [Migration](https://github.com/BerriAI/litellm/blob/main/litellm-proxy-extras/litellm_proxy_extras/migrations/20260205144610_add_soft_budget_to_team_table/migration.sql) |
+| `LiteLLM_DeletedTeamTable` | New Column | Added `soft_budget` (double precision) | [PR #20653](https://github.com/BerriAI/litellm/pull/20653) | [Migration](https://github.com/BerriAI/litellm/blob/main/litellm-proxy-extras/litellm_proxy_extras/migrations/20260207110613_add_soft_budget_to_deleted_teams_table/migration.sql) |
+| `LiteLLM_MCPServerTable` | New Column | Added `available_on_public_internet` boolean for MCP IP-based access control | [PR #20607](https://github.com/BerriAI/litellm/pull/20607) | [Migration](https://github.com/BerriAI/litellm/blob/main/litellm-proxy-extras/litellm_proxy_extras/migrations/20260207093506_add_available_on_public_internet_to_mcp_servers/migration.sql) |
+
+---
+
+## Documentation Updates (15 updates)
+
+- Update v1.81.6 release notes - Logs v2 with Tool Call Tracing - [PR #20225](https://github.com/BerriAI/litellm/pull/20225)
+- Add FAQ for setting up and verifying LITELLM_LICENSE - [PR #20284](https://github.com/BerriAI/litellm/pull/20284)
+- Model request tags documentation - [PR #20290](https://github.com/BerriAI/litellm/pull/20290)
+- Add Prisma migration troubleshooting guide - [PR #20300](https://github.com/BerriAI/litellm/pull/20300)
+- MCP Semantic Filtering documentation - [PR #20316](https://github.com/BerriAI/litellm/pull/20316)
+- Add CopilotKit SDK doc as supported agents SDK - [PR #20396](https://github.com/BerriAI/litellm/pull/20396)
+- Add documentation for Nova Sonic - [PR #20320](https://github.com/BerriAI/litellm/pull/20320)
+- Update Vertex AI Text to Speech doc to show use of audio - [PR #20255](https://github.com/BerriAI/litellm/pull/20255)
+- Improve Okta SSO setup guide with step-by-step instructions - [PR #20353](https://github.com/BerriAI/litellm/pull/20353)
+- Langfuse doc update - [PR #20443](https://github.com/BerriAI/litellm/pull/20443)
+- Expose MCPs on public internet documentation - [PR #20626](https://github.com/BerriAI/litellm/pull/20626)
+- Add blog post: Achieving Sub-Millisecond Proxy Overhead - [PR #20309](https://github.com/BerriAI/litellm/pull/20309)
+- Add blog post about litellm-observatory - [PR #20622](https://github.com/BerriAI/litellm/pull/20622)
+- Update Opus 4.6 blog with adaptive thinking - [PR #20637](https://github.com/BerriAI/litellm/pull/20637)
+- `gpt-5-search-api` docs clarifications - [PR #20512](https://github.com/BerriAI/litellm/pull/20512)
+
+---
+
+## New Contributors
+* @Quentin-M made their first contribution in [PR #19818](https://github.com/BerriAI/litellm/pull/19818)
+* @amirzaushnizer made their first contribution in [PR #20235](https://github.com/BerriAI/litellm/pull/20235)
+* @cscguochang made their first contribution in [PR #20214](https://github.com/BerriAI/litellm/pull/20214)
+* @krauckbot made their first contribution in [PR #20273](https://github.com/BerriAI/litellm/pull/20273)
+* @agrattan0820 made their first contribution in [PR #19784](https://github.com/BerriAI/litellm/pull/19784)
+* @nina-hu made their first contribution in [PR #20472](https://github.com/BerriAI/litellm/pull/20472)
+* @swayambhu94 made their first contribution in [PR #20469](https://github.com/BerriAI/litellm/pull/20469)
+* @ssadedin made their first contribution in [PR #20566](https://github.com/BerriAI/litellm/pull/20566)
+
+---
+
+## Full Changelog
+[v1.81.6-nightly...v1.81.9](https://github.com/BerriAI/litellm/compare/v1.81.6-nightly...v1.81.9)