Anthropic: Claude Sonnet 4.5
This AI model, Claude Sonnet 4.5 from Anthropic, supports input in three formats: text, image, and file. It can process extremely long contexts, with a maximum limit of one million characters. The model also offers tools and reasoning capabilities. However, it does not produce structured output. The price point for this model is $3.0 per million input tokens and $15.0 per million output tokens. Its benchmark standing is a blended score of 56.2 across two independent assessments. Although its coverage on the benchmarks is limited to only two, those who may consider shortlisting it include users who require handling multiple modalities or need high context lengths. Despite its higher cost, it might be a suitable choice for organizations with specific requirements that align with this model's capabilities.
Benchmark results
Independent, published benchmarks. Blended score 56.2 across 2 benchmarks, last refreshed 2026-09-10. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 31.9 |
| EQ-Bench | emotional understanding in dialogue | 72.2 |
- Model ID
- anthropic/claude-sonnet-4.5
- Vendor
- anthropic
- Released
- September 2025
- Tokenizer
- Claude
- Input Modalities
- text, image, file
- Output Modalities
- text
- Max Output
- 64,000 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 $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 4.5 places across the 4 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #24 | Code RefactoringCode · of 25 ranked | 150 |
| #24 | Transcript CleanupWriting · of 25 ranked | 140 |
| #24 | RAG PipelinesAgents · of 25 ranked | 150 |
| #24 | Long-Context Q&AAgents · of 25 ranked | 146 |
Similar models
Claude Opus 5 (batch)
Anthropic: Claude Sonnet 5
Anthropic: Claude Sonnet 5 (batch)
Anthropic: Claude Opus 4.8 (batch)
Anthropic: Claude Opus 4.7 (batch)
Anthropic: Claude Sonnet 4.6
Quick answers
- How much does Anthropic: Claude Sonnet 4.5 cost?
- $3.00 per million input tokens and $15.00 per million output tokens.
- What is Anthropic: Claude Sonnet 4.5's context window?
- 1,000,000 tokens, roughly 1,500 pages of text in a single request.
- Does Anthropic: Claude Sonnet 4.5 support tool calling?
- It supports tool calling, structured output, a reasoning mode.
- Can Anthropic: Claude Sonnet 4.5 process images?
- Yes, it accepts image input.