Claude Opus 5 · context window1M tokens

Valid from

2026-07-24

Valid until

still holds

Published

no source on record carries a date

Recorded by AsOf

2026-11-04

Checked

2026-11-04 · its source page states the value and the date

Confidence

0.95

Sources

“July 24, 2026 We’ve launched Claude Opus 5 ( claude-opus-5 ), a step-change improvement over Claude Opus 4.8. Claude Opus 5 supports a 1M token context window”— what the page says, read 2026-11-04

• https://platform.claude.com/docs/en/release-notes/overviewprimary · platform.claude.com

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