Anthropic: Claude Sonnet 4
Claude Sonnet 4 from Anthropic is designed to process extensive text and handle diverse input modalities including text, images, and files. It supports reasoning capabilities and can engage with external tools for enhanced functionality. With a context length of one million tokens, it excels in handling complex tasks that require deep understanding and interaction. This model should be considered by those who need robust, multi-modal processing power and the ability to integrate external tools, though its price point of $3.0 per million input tokens and $15.0 per million output tokens makes it more suitable for projects with a defined budget. Its blended benchmark score of 59.1 across five independent benchmarks suggests strong performance in specific areas but may not be the best overall choice if cost is a significant factor.
Benchmark results
Independent, published benchmarks. Blended score 57.9 across 5 benchmarks, last refreshed 2026-07-25. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| Aider Polyglot | code editing across languages | 64.9 |
| AI Index | broad capability composite | 42.1 |
| AI Index Coding | software engineering tasks | 62.0 |
| AI Index Agentic | multi-step tool-using tasks | 27.5 |
| EQ-Bench | emotional understanding in dialogue | 66.6 |
- Model ID
- anthropic/claude-sonnet-4
- Vendor
- anthropic
- Released
- May 2025
- Tokenizer
- Claude
- Input Modalities
- image, text, file
- Output Modalities
- text
- Max Output
- 64,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- not supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- yes
What it costs in practice
Computed from the current $3.00/M input and $15.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.11 |
| Classify 1,000 customer emails | 500k in / 50k out | $2.25 |
| A month of a busy support chatbot | 5M in / 2M out | $45.00 |
Category rankings
Where Anthropic: Claude Sonnet 4 places across the 28 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #15 | Legal ResearchProfessional · of 25 ranked | 166 |
| #15 | Scientific ResearchProfessional · of 25 ranked | 166 |
| #15 | Long-Context Q&AAgents · of 25 ranked | 154 |
| #15 | Fiction CollaboratorPersonal · of 25 ranked | 166 |
| #15 | Literature ReviewResearch · of 25 ranked | 166 |
| #16 | Long-Document SummarizationWriting · of 25 ranked | 158 |
| #17 | Physics TutoringEducation · of 25 ranked | 143 |
| #18 | Creative WritingWriting · of 25 ranked | 155 |
| #18 | Screenwriting & DialogWriting · of 25 ranked | 155 |
| #18 | Academic WritingWriting · of 25 ranked | 155 |
| #18 | Legal DraftingProfessional · of 25 ranked | 155 |
| #18 | History TutoringEducation · of 25 ranked | 143 |
| #18 | OKRs & Strategic PlanningBusiness · of 25 ranked | 155 |
| #18 | Math ProofsResearch · of 25 ranked | 155 |
| #19 | Character RoleplayPersonal · of 25 ranked | 147 |
| #20 | Code RefactoringCode · of 25 ranked | 160 |
| #20 | Bug FixingCode · of 25 ranked | 172 |
| #20 | Contract ReviewProfessional · of 25 ranked | 172 |
| #20 | RAG PipelinesAgents · of 25 ranked | 160 |
| #20 | Scientific CodingResearch · of 25 ranked | 172 |
| #21 | Code ReviewCode · of 25 ranked | 160 |
| #21 | Essay GradingEducation · of 25 ranked | 160 |
| #21 | Agent WorkflowsAgents · of 25 ranked | 181 |
| #21 | Coding AgentsAgents · of 25 ranked | 181 |
| #23 | ETL ScriptingData · of 25 ranked | 148 |
| #23 | Blog Post WritingWriting · of 25 ranked | 135 |
| #23 | Medical Note SummarizationProfessional · of 25 ranked | 148 |
| #23 | Trip PlanningPersonal · of 25 ranked | 135 |
Similar models
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Quick answers
- How much does Anthropic: Claude Sonnet 4 cost?
- $3.00 per million input tokens and $15.00 per million output tokens.
- What is Anthropic: Claude Sonnet 4's context window?
- 1,000,000 tokens, roughly 1,500 pages of text in a single request.
- Does Anthropic: Claude Sonnet 4 support tool calling?
- It supports tool calling, a reasoning mode.
- Can Anthropic: Claude Sonnet 4 process images?
- Yes, it accepts image input.