Claude Sonnet 4.5
claude-sonnet-4-5-20250929
Anthropic · reasoning · api
Intelligence
Context
200K
Max output
64K
Input $/1M
$3.00
Output $/1M
$15.00
Modalities
text · image · document
Released
29 Sept 2025
Intelligence Index via Artificial Analysis · 0–100, higher is better
AI summary
● machine-written
Claude Sonnet 4.5 API released September 29, 2025
Claude Sonnet 4.5 is Anthropic's advanced Sonnet model optimized for real-world agents and coding workflows. It offers a 1M token context window with 64K maximum output, priced at $3 per million input tokens and $15 per million output tokens. The model supports text, image, and document inputs across multiple deployment platforms.
What's new
- Released September 29, 2025
- 1M token context window with 64K max output
- Available across 6 providers including AWS, Azure, and Google Cloud
- Supports prompt caching at $0.30 per 1M cached tokens
- Scores 86.0 on MMLU Pro (93rd percentile), 72.7 on GPQA (59th percentile)
Best for
Real-world agent systemsCoding workflowsLong-context handling with vision capabilitiesCost-optimized deployments requiring balanced performance
Common questions about Claude Sonnet →
Source: https://docs.claude.com/en/docs/about-claude/models/overview