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Claude Sonnet 4.6

Claude Sonnet 4.6 is an AI model made by Anthropic. Anthropic released it on 17 February 2026. It is generally available.

Anthropic

Claude Sonnet 4.6 is an AI model made by Anthropic. Anthropic released it on 17 February 2026. It is generally available. Its context window is 1,000,000 tokens. Its longest answer is 128,000 tokens. Through the API it costs $3.00 per 1M tokens for input and $15.00 per 1M tokens for output.

Released
17 February 2026 — www.anthropic.com, read 16 October 2026
Status
Generally available — docs.anthropic.com, read 16 October 2026
Takes
Text, Image — www.anthropic.com, read 16 October 2026
Returns
Not confirmed: two readings disagree: text, audio and text
Open weights
Not confirmed: The maker's reviewed model, system-card, and API documentation pages do not state whether Claude Sonnet 4.6 has open weights.
Licence
Not confirmed: The maker's reviewed pages do not print a model-specific licence name.
Context window
1,000,000 tokens — platform.claude.com, read 16 October 2026
Longest answer
128,000 tokens — platform.claude.com, read 16 October 2026
Knowledge cutoff
Not confirmed: Anthropic's official pages conflict: the Transparency Hub gives a knowledge cutoff date of May 2025, while the model overview gives a reliable knowledge cutoff of Aug 2025. I cannot confirm one date from these pages.
API price, input
$3.00 per 1M tokens — platform.claude.com, read 16 October 2026
API price, output
$15.00 per 1M tokens — platform.claude.com, read 16 October 2026
Where
API, Consumer app, Cloud marketplaces — www.anthropic.com, read 16 October 2026
Parameters
Not confirmed: The maker's reviewed model, system-card, and API documentation pages do not publish a parameter count for Claude Sonnet 4.6.
Model card
https://www-cdn.anthropic.com/78073f739564e986ff3e28522761a7a0b4484f84.pdf — www-cdn.anthropic.com, read 16 October 2026

Benchmarks

Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.

Arena

Arena’s leaderboard dataset (lmarena-ai/leaderboard-dataset on Hugging Face), CC BY 4.0: ratings from people’s votes between two anonymous models, as Arena publishes them. Data · CC BY 4.0

Epoch AI

Epoch AI, ‘Capabilities & benchmarking’, epoch.ai/benchmarks, CC BY 4.0: Epoch AI’s own runs and its Capabilities Index. Data · CC BY 4.0

Questions

When was Claude Sonnet 4.6 released?

Anthropic released Claude Sonnet 4.6 on 17 February 2026.

Is Claude Sonnet 4.6 still available?

Yes: it is generally available, as Anthropic states it.

What is the context window of Claude Sonnet 4.6?

The context window of Claude Sonnet 4.6 is 1,000,000 tokens, as Anthropic prints it.

How much does the Claude Sonnet 4.6 API cost?

On the standard tier, Claude Sonnet 4.6 costs $3.00 per 1M tokens for input and $15.00 per 1M tokens for output, as Anthropic lists it.

More from Anthropic

Sources

  1. Introducing Sonnet 4.6 (read 16 October 2026)
  2. Anthropic’s Transparency Hub (read 16 October 2026)
  3. Model deprecations (read 16 October 2026)
  4. Claude Sonnet 4.6 - Claude Platform Docs (read 16 October 2026)
  5. Claude Sonnet 4.6 System Card (read 16 October 2026)

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