Anthropic: Claude Sonnet 4.5
This AI model, developed by Anthropic, is called Claude Sonnet 4.5. It can handle various input types, including text, images, and files, with a maximum context length of 100,000 tokens. The model supports tools integration and has reasoning capabilities. If budget is a concern, this model's price point may be worth considering. At $3.00 per million input tokens and $15.00 per million output tokens, it falls within the mid-range for its class. Its benchmark performance is also noteworthy, with a blended score of 56.2 across two independent tests. Those seeking to integrate AI tools into their workflow or requiring a model that can handle complex reasoning tasks may want to shortlist this option.
Benchmark results
Independent, published benchmarks. Blended score 54.9 across 2 benchmarks, last refreshed 2026-10-13. 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 |
|---|---|---|
| #23 | Transcript CleanupWriting · of 25 ranked | 140 |
| #25 | Code RefactoringCode · of 25 ranked | 150 |
| #25 | RAG PipelinesAgents · of 25 ranked | 150 |
| #25 | Long-Context Q&AAgents · of 25 ranked | 146 |
Similar models
Anthropic: Claude Haiku 5.5
Anthropic: Claude Haiku 5.5 (batch)
Anthropic: Claude Sonnet 5.5
Anthropic: Claude Sonnet 5.5 (batch)
Anthropic: Claude Opus 5.5 (batch)
Anthropic: Claude Opus 5 (batch)
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.