Anthropic
Claude Sonnet 4.5
Anthropic's September 29, 2025 Sonnet model remains active as a legacy option. It accepts text and images and produces text, with a 200K-token context window, up to 64K output and extended thinking. Standard Claude API rates are $3/$15 per MTok (input/output). Anthropic reported 61.4% on OSWorld at launch; this is a historical vendor result, not a current leaderboard claim.
200K tokens
Multimodal
Pro
- Provider
- Anthropic
- Context
- 200KCatalog · As of Aug 11, 2026Stale · 31d old
- yno subscription tier
- Pro
- Released
- Sep 29, 2025
- Speed
- Fast
- Reasoning
- Advanced
- Modality
- Multimodal
Benchmarks
Quality
- AA Intelligence Index
- LiveCodeBench
- 59%Artificial Analysis · Date unknownAge unknown
- GPQA Diamond
- 72.7%Artificial Analysis · Date unknownAge unknown
Speed and latency
- Output speed
API pricing
- API input cost
- API output cost
Benchmark variant: Claude 4.5 Sonnet (Non-reasoning)
AA data retrieved Sep 11, 2026 · Artificial Analysis
Indexes use points; evaluations use accuracy percentages. API measurements do not measure yno application performance. Methodology
Capabilities
- Code
- Debugging
- Refactoring
- Technical Writing
- Vision
Use cases
- Full-stack development
- Code review
- Bug fixing
- Documentation
Strengths
- Text and image input
- Extended thinking
- 200K context / 64K output
- Coding and computer-use tasks
Best for
Teams maintaining Sonnet 4.5 integrations or comparing migration options for coding workflows
Use Claude Sonnet 4.5 in yno.ai
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Related models
Frequently asked
- What is Claude Sonnet 4.5?
- Anthropic's September 29, 2025 Sonnet model remains active as a legacy option. It accepts text and images and produces text, with a 200K-token context window, up to 64K output and extended thinking. Standard Claude API rates are $3/$15 per MTok (input/output). Anthropic reported 61.4% on OSWorld at launch; this is a historical vendor result, not a current leaderboard claim.
- How much does Claude Sonnet 4.5 cost in yno.ai?
- Claude Sonnet 4.5 is available on the Pro tier of yno.ai.
- What can Claude Sonnet 4.5 do?
- Claude Sonnet 4.5 is best for Teams maintaining Sonnet 4.5 integrations or comparing migration options for coding workflows. Its main capabilities include Code, Debugging, Refactoring, Technical Writing, Vision.
- How does Claude Sonnet 4.5 compare to other models?
- Claude Sonnet 4.5 excels at Text and image input and is recommended for Full-stack development, Code review, Bug fixing, Documentation. See related models below.
- How do I use Claude Sonnet 4.5 in yno.ai?
- Sign up for yno.ai, select Claude Sonnet 4.5 from the model picker, and start chatting.