Model Tracker

Claude Sonnet 4

Claude Sonnet 4 is an AI model made by Anthropic. Anthropic released it on 22 May 2025. Anthropic retired it on 15 June 2026. Through the API it costs $3.

Anthropic

Claude Sonnet 4 is an AI model made by Anthropic. Anthropic released it on 22 May 2025. Anthropic retired it on 15 June 2026. Through the API it costs $3.00 per 1M tokens for input and $15.00 per 1M tokens for output. Its knowledge cutoff is January 2025.

Released: 22 May 2025 — www.anthropic.com, read 16 October 2026
Status: Not confirmed: two readings disagree: retired and ga
Takes: Not confirmed: two readings disagree: text, image and text
Returns: Not confirmed: two readings disagree: text, audio and text
Open weights: Not confirmed: The cited Anthropic pages do not state whether Claude Sonnet 4's weights are open or downloadable.
Licence: Not confirmed: The cited Anthropic pages do not name a licence for Claude Sonnet 4.
Context window: Not confirmed: two readings disagree: 200000 and 1000000
Longest answer: Not confirmed: its line was not found on its page, and a second reading did not confirm it
Knowledge cutoff: January 2025 — www.anthropic.com, read 16 October 2026
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Parameters: Not confirmed: The cited Anthropic pages do not publish a parameter count for Claude Sonnet 4.
Model card: https://www-cdn.anthropic.com/4263b940cabb546aa0e3283f35b686f4f3b2ff47.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

Text Arena, claude-sonnet-4-20250514-thinking-32k: 1,402 (1,397–1,406, 34,132 votes), published 15 October 2026
Text Arena, claude-sonnet-4-20250514: 1,391 (1,386–1,395, 39,163 votes), published 15 October 2026
Vision Arena, claude-sonnet-4-20250514-thinking-32k: 1,206 (1,189–1,223, 1,145 votes), published 9 October 2026
Vision Arena, claude-sonnet-4-20250514: 1,188 (1,174–1,202, 1,807 votes), published 9 October 2026

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 Capabilities Index, Claude Sonnet 4: 141.7 (138.7–143.1), as of 19 October 2026
GPQA Diamond, claude-sonnet-4-20250514_59K: 79.2% (± 2.7), run 26 May 2025
GPQA Diamond, claude-sonnet-4-20250514_32K: 78.3% (± 2.9), run 22 May 2025
GPQA Diamond, claude-sonnet-4-20250514_16K: 75.8% (± 3.1), run 22 May 2025
GPQA Diamond, claude-sonnet-4-20250514: 66.7% (± 3.4), run 22 May 2025
OTIS Mock AIME 2024–2025, claude-sonnet-4-20250514_32K: 71.1% (± 6.8), run 22 May 2025
OTIS Mock AIME 2024–2025, claude-sonnet-4-20250514_59K: 68.9% (± 7.0), run 23 May 2025
OTIS Mock AIME 2024–2025, claude-sonnet-4-20250514_16K: 53.3% (± 7.5), run 22 May 2025
OTIS Mock AIME 2024–2025, claude-sonnet-4-20250514: 28.9% (± 6.8), run 22 May 2025

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 released?

Anthropic released Claude Sonnet 4 on 22 May 2025.

How much does the Claude Sonnet 4 API cost?

On the standard tier, Claude Sonnet 4 costs $3.00 per 1M tokens for input and $15.00 per 1M tokens for output, as Anthropic lists it.

What is the knowledge cutoff of Claude Sonnet 4?

The knowledge cutoff of Claude Sonnet 4 is January 2025.

Sources

Introducing Claude 4 (read 16 October 2026)
Anthropic’s Transparency Hub (read 16 October 2026)
Model deprecations (read 16 October 2026)
Pricing (read 16 October 2026)
Claude Sonnet 4 (read 16 October 2026)
System Card: Claude Opus 4 & Claude Sonnet 4 (read 16 October 2026)

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