Anthropic: Claude Sonnet 4 Context window change — 2026-09-21 16:16:00 UTC
OpenRouter · Detected 2026-09-21T16:16:00.848Z
Original source: https://openrouter.ai/api/v1/modelsContext window
Before: 1,000,000
After: 200,000
These values are captured from the named source, confirmed on consecutive observations, and held for six hours to screen rapid reversals. OpenRouter-listed changes describe its catalog, not necessarily a direct provider price change.
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