Claude Sonnet 4

2025-05-22 · Publisher : Anthropic · Domain : Artificial Intelligence

Anthropic launches Claude Sonnet 4, a major upgrade of Sonnet 3.7 with better coding and instruction-following capabilities, at the same price, and available to free users.

What changes

  • 72.7% on SWE-bench Verified, versus 63.7% for Sonnet 3.7: a balance between capability and efficiency for broad deployment.
  • Extended thinking with tool use (beta), parallel tool execution, better instruction following.
  • 65% reduction in workaround behaviors (shortcuts) on agentic tasks compared with Sonnet 3.7.
  • Available to free Claude.ai users, unlike Opus 4.
  • Later additions: 1 million token context in beta on Sonnet 4 since August 12, 2025 (higher pricing beyond 200K tokens).

### Specifications - API identifier: claude-sonnet-4-20250514 (retired from the API on June 15, 2026). - Availability: Claude.ai (including the free plan), Anthropic API, Amazon Bedrock, Google Cloud Vertex AI. - Context window 200K tokens originally (secondary source), maximum output 64K (secondary source), knowledge cutoff not disclosed in the announcement. - Modalities: text and images as input, text as output. ### Pricing | Input (USD / M tokens) | Output (USD / M tokens) | Cache write 5 min | Cache read | Batch | |---|---|---|---|---| | 3 | 15 | 3.75 | 0.30 | 1.50 / 7.50 | The amount of the long-context tier (beyond 200K tokens) was not verified. ### Benchmarks | Benchmark | Claude Opus 4 | Claude Sonnet 4 | |---|---|---| | SWE-bench Verified | 72.5% | 72.7% | | SWE-bench (high compute) | 79.4% | 80.2% | | Terminal-bench | 43.2% | not included | | GPQA Diamond (extended thinking) | 75.8% | 71.4% | | MMMLU (extended thinking) | 88.0% | 85.8% | | MMMU (extended thinking) | 74.6% | 73.3% | | AIME (extended thinking) | 34.5% | 33.5% | Scores published by the vendor. ### Key takeaways Sonnet 4 keeps the price of Sonnet 3.7 while gaining about 9 points on SWE-bench Verified, making it the default model for large-scale coding in the 4 family.

Links

Tags : LLM, Anthropic, Claude, Sonnet, Codage, Agents