Claude Sonnet 4.6

Key facts

Where Claude Sonnet 4.6 sits in our data

• Released Feb 17, 2026 (week 8 of 2026), in February 2026. Other models in our data released that month: Gemini 3.1 Pro, GLM-5, Claude Opus 4.6.
• The previous Anthropic model we track is Claude Opus 4.6 (Feb 5, 2026), 12 days earlier.
• Anthropic tools we cover: Claude Code, Claude.
• All releases by date: AI model releases by month · new AI models this week. Choosing for code: best LLM for coding.

How Claude Sonnet 4.6 differs from Claude Opus 4.6

Read from the recorded facts of the two models, not from a head-to-head test. We have not run either.

• We have no recorded price for Claude Sonnet 4.6; Claude Opus 4.6 has one.
• Claude Sonnet 4.6 came out 12 days after Claude Opus 4.6.
• Facts for the other model: Claude Opus 4.6.

What we tested

Nothing yet. We have not run Claude Sonnet 4.6 ourselves, so every fact on this page is Reported from the sources below. When we do test it, the scope will be stated here and in our test logs. See methodology.

Not verified, left out

We could not confirm these on a vendor page, so we do not state them.

• The 1M-token context window is described as beta in the release notes, so no standard context value is recorded.
• Price and max output were not captured for this model.

Sources

• Claude Platform release notes
• Anthropic models overview

More from Anthropic

• Claude Opus 4.6 (Feb 5, 2026)
• Claude Opus 4.7 (Apr 16, 2026)
• Claude Opus 4.8 (May 28, 2026)
• Claude Fable 5 (Jun 9, 2026)
• Claude Mythos 5 (Jun 9, 2026)
• Claude Sonnet 5 (Jun 30, 2026)
• Claude Opus 5 (Jul 24, 2026)

All 88 models