Anthropic: Claude Sonnet 5.5
The Anthropic model, Claude Sonnet 5.5, is a multimodal AI system that accepts input in text, image, and file formats, with a context length of up to 1 million tokens. It supports both tools and reasoning capabilities, but does not provide structured output. When considering this model for your needs, its price point is a significant factor: $2.0 per million input tokens and $10.0 per million output tokens may be reasonable for those with deep pockets or specific use cases where the high performance justifies the cost. With a blended benchmark score of 97.0 across one independent evaluation, Claude Sonnet 5.5 has demonstrated strong capabilities, making it worth shortlisting for applications requiring robust reasoning and multimodal input handling.
Benchmark results
Independent, published benchmarks. Blended score 97.0 across 1 benchmark, last refreshed 2026-10-04. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 92.4 |
- Model ID
- anthropic/claude-sonnet-5.5
- Vendor
- anthropic
- Released
- September 2026
- Tokenizer
- Claude
- Input Modalities
- text, image, file
- Output Modalities
- text
- Max Output
- 128,000 tokens
- Tool Calling
- ✓ supported
- Structured Output
- ✓ supported
- Reasoning Mode
- ✓ supported
- Vision
- ✓ accepts images
- Audio
- no
- Moderated
- yes
What it costs in practice
Computed from the current $2.00/M input and $10.00/M output rates. Run your own numbers →
| Job | Tokens | Cost |
|---|---|---|
| Summarize a 50-page report | 30k in / 1.5k out | $0.07 |
| Classify 1,000 customer emails | 500k in / 50k out | $1.50 |
| A month of a busy support chatbot | 5M in / 2M out | $30.00 |
Category rankings
Where Anthropic: Claude Sonnet 5.5 places across the 47 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #9 | Screenshot DebuggingVision · of 25 ranked | 135 |
| #13 | Frontend Component DesignCode · of 25 ranked | 133 |
| #13 | Chart & Graph ReadingVision · of 25 ranked | 139 |
| #16 | Marketing CopyWriting · of 25 ranked | 122 |
| #16 | Standardized Test PrepEducation · of 25 ranked | 122 |
| #16 | Diagram ExtractionVision · of 25 ranked | 134 |
| #17 | Browser AutomationAgents · of 25 ranked | 141 |
| #18 | Regex WritingCode · of 25 ranked | 126 |
| #18 | Language TranslationWriting · of 25 ranked | 126 |
| #18 | Math TutoringEducation · of 25 ranked | 129 |
| #18 | Physics TutoringEducation · of 25 ranked | 135 |
| #18 | Resume WritingBusiness · of 25 ranked | 113 |
| #18 | Fitness CoachingPersonal · of 25 ranked | 121 |
| #18 | Tutoring for KidsPersonal · of 25 ranked | 126 |
| #20 | Financial AnalysisProfessional · of 25 ranked | 133 |
| #20 | Experiment DesignResearch · of 25 ranked | 133 |
| #21 | CI/CD PipelinesCode · of 25 ranked | 131 |
| #21 | Data AnalysisData · of 25 ranked | 137 |
| #21 | Blog Post WritingWriting · of 25 ranked | 131 |
| #21 | Trip PlanningPersonal · of 25 ranked | 131 |
| #23 | Code RefactoringCode · of 25 ranked | 150 |
| #23 | Unit Test GenerationCode · of 25 ranked | 135 |
| #23 | Creative WritingWriting · of 25 ranked | 145 |
| #23 | Screenwriting & DialogWriting · of 25 ranked | 145 |
| #23 | Academic WritingWriting · of 25 ranked | 145 |
| #23 | Legal DraftingProfessional · of 25 ranked | 145 |
| #23 | Legal ResearchProfessional · of 25 ranked | 155 |
| #23 | Scientific ResearchProfessional · of 25 ranked | 155 |
| #23 | History TutoringEducation · of 25 ranked | 136 |
| #23 | OKRs & Strategic PlanningBusiness · of 25 ranked | 145 |
| #23 | RAG PipelinesAgents · of 25 ranked | 150 |
| #23 | Long-Context Q&AAgents · of 25 ranked | 146 |
| #23 | Character RoleplayPersonal · of 25 ranked | 141 |
| #23 | Fiction CollaboratorPersonal · of 25 ranked | 155 |
| #23 | Math ProofsResearch · of 25 ranked | 145 |
| #23 | Literature ReviewResearch · of 25 ranked | 155 |
| #24 | Long-Document SummarizationWriting · of 25 ranked | 151 |
| #25 | SQL GenerationCode · of 25 ranked | 143 |
| #25 | Code ReviewCode · of 25 ranked | 149 |
| #25 | Bug FixingCode · of 25 ranked | 153 |
| #25 | ETL ScriptingData · of 25 ranked | 140 |
| #25 | Contract ReviewProfessional · of 25 ranked | 159 |
| #25 | Medical Note SummarizationProfessional · of 25 ranked | 140 |
| #25 | Essay GradingEducation · of 25 ranked | 149 |
| #25 | RFP ResponseBusiness · of 25 ranked | 154 |
| #25 | SOP / Process DocsBusiness · of 25 ranked | 121 |
| #25 | Scientific CodingResearch · of 25 ranked | 153 |
Similar models
Anthropic: Claude Sonnet 5.5 (batch)
Anthropic: Claude Opus 5.5 (batch)
Anthropic: Claude Opus 5 (batch)
Anthropic: Claude Sonnet 5
Anthropic: Claude Sonnet 5 (batch)
Anthropic: Claude Opus 4.8 (batch)
Quick answers
- How much does Anthropic: Claude Sonnet 5.5 cost?
- $2.00 per million input tokens and $10.00 per million output tokens.
- What is Anthropic: Claude Sonnet 5.5's context window?
- 1,000,000 tokens, roughly 1,500 pages of text in a single request.
- Does Anthropic: Claude Sonnet 5.5 support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can Anthropic: Claude Sonnet 5.5 process images?
- Yes, it accepts image input.