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Anthropic

Is Claude Sonnet 4.5 out? Yes, since September 29, 2025

Yes. Claude Sonnet 4.5 was released on September 29, 2025.

A browser notification for each confirmed release in this family. No account or email.

Have you used it? Claude Sonnet 4.5

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Lab
Anthropic
Family
Claude
Release date
Source
Anthropic · Claude Sonnet 4.5

What changed

  • context 1M tokens · Context window of Claude Sonnet 4.5. Claude Opus 4.1 is the previous model of the same tier, but the gap is beyond what a percentage explains.
  • price -80 % · Prompt price compared with Claude Opus 4.1, same tier in this family. Went from $15.00 / MTok to $3.00 / MTok. Lower is better.

About Claude Sonnet 4.5

Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...

Next Claude model to watch

Questions

When was Claude Sonnet 4.5 released?
Claude Sonnet 4.5 was released on September 29, 2025.
Who makes Claude Sonnet 4.5?
Claude Sonnet 4.5 is made by Anthropic.
What comes after Claude Sonnet 4.5?
Claude Haiku 4.5, released on October 15, 2025.