Anthropic: Claude Sonnet 4.5
Claude Sonnet 4.5 from Anthropic is designed for extensive text and multimodal inputs, including images and files, with a context length of up to one million tokens. It supports reasoning and tools integration, allowing for more dynamic interactions. However, structured output capabilities are not specified. This model should be considered by those needing robust handling of diverse input types and advanced reasoning abilities. With a blended benchmark score of 65.2 across four benchmarks, it stands as a solid choice, though its price point at $3.0 per million input tokens and $15.0 per million output tokens might make it less appealing for more cost-sensitive applications.
Benchmark results
Independent, published benchmarks. Blended score 65.2 across 4 benchmarks, last refreshed 2026-08-13. How scoring works →
| Benchmark | Measures | Score |
|---|---|---|
| AI Index | broad capability composite | 49.4 |
| AI Index Coding | software engineering tasks | 86.0 |
| AI Index Agentic | multi-step tool-using tasks | 43.6 |
| 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 2 categories it ranks in. How we rank →
| # | Category | Score |
|---|---|---|
| #23 | Meeting NotesBusiness · of 25 ranked | 150 |
| #24 | Transcript CleanupWriting · of 25 ranked | 141 |
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.