Claude · context window1M tokens

Valid from

2026-05-28

Valid until

still holds

Published

2026-05-28

Recorded by AsOf

2026-10-31

Checked

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

Confidence

0.70

Sources

“May 28, 2026 We’ve launched Claude Opus 4.8 ( claude-opus-4-8 ), our most capable model. Claude Opus 4.8 supports a 1M token context window by default on the Claude API, Amazon Bedrock, Google Cloud, and Microsoft Foundry, 128k max output tokens”— what the page says, read 2026-11-04

• Claude Platform release notes, May 28, 2026primary · platform.claude.com · 2026-05-28
• Claude Platform release notes, June 30, 2026primary · platform.claude.com · 2026-06-30
• Claude Platform release notes, September 1, 2026primary · platform.claude.com · 2026-09-01
• Claude Platform release notes, September 22, 2026primary · platform.claude.com · 2026-09-22
• Claude Platform release notes, July 24, 2026primary · platform.claude.com · 2026-07-24

Supersedes

• 200k-token context window2026-04-30 to 2026-05-28 · clm_73ED3FBFED64

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