Claude · context window200k-token context window

Superseded: a later claim replaced it. It was the record's answer for the dates it held.

Valid from

2026-04-30

Valid until

2026-05-28

Published

2026-04-30

Recorded by AsOf

2026-10-31

Checked

2026-10-31 · its source page states the value and the date

Confidence

0.70

Replaced by

clm_88C0D7E932E0

Sources

“We’ve retired the 1M token context window beta ( context-1m-2025-08-07 ) for Claude Sonnet 4.5 and Claude Sonnet 4. The beta header now has no effect on these models, and requests exceeding the standard 200k-token context window return an error.”— what the page says, read 2026-10-31

• Claude Platform release notes, April 30, 2026primary · platform.claude.com · 2026-04-30

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