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Kenneth Wong
2b780ceae3
Claude Code resolves ANTHROPIC_DEFAULT_FABLE_MODEL through a resolver that strips the [1m] suffix before use, unlike the opus/sonnet resolvers which pass their env value through untouched. The stripped value is then treated as an env-supplied default and held to the standard 200k window instead of the model's native 1M, so writing [1m] into that key costs the long context window rather than granting it. Measured against a Claude Code 2.1.259 session (`/context` on a live proxy endpoint): ANTHROPIC_MODEL=claude-fable-5-1[1m] -> 1m window ANTHROPIC_MODEL=claude-fable-5-1 -> 200k window ANTHROPIC_DEFAULT_FABLE_MODEL=claude-fable-5-1[1m] -> 200k window The fix is key-scoped rather than model-scoped, since the suffix is what grants 1M on every other key. Adds envKeyAcceptsExtendedContextSuffix() as the single place recording which keys reject the suffix, enforces it as a floor inside applyExtendedContextPreferenceToAnthropicModels() so no caller can bypass it, and strips a previously saved suffix from that key on the next launch through the auto path. Also extends the preference to CLAUDE_CODE_SUBAGENT_MODEL. Subagent windows come from the same resolver as the main loop (the Explore inheritCap bounds the model tier, not the context window), so a bare subagent model id sits at 200k while the suffixed form gets 1M. The new key list is kept separate from ANTHROPIC_MODEL_ENV_KEYS, which also drives routing, model-id normalization and profile validation. Claude-Session: https://claude.ai/code/session_01NPkafQjVf4pSwPBwBistGk