Claude Sonnet 4 vs Claude Sonnet 4.5. Price, context, routing

Source page: https://www.o10.io/compare-models/anthropic-claude-sonnet-4-vs-anthropic-claude-sonnet-4-5

Plain-text reference for reading, copying, and citation. Examples are illustrative; use your own credentials for API requests.

Model data: https://www.o10.io/api/models.json
Content index: https://www.o10.io/llms.txt
Prices are dated references, not live quotes. Check the current endpoint rate before use.

# Claude Sonnet 4 vs Claude Sonnet 4.5. Price, context, routing

Claude Sonnet 4 is cheaper at $3/M input vs $3/M input for Claude Sonnet 4.5. Compare context, hosts, and o10 routing bands.

## Key takeaways

### Which is cheaper, Claude Sonnet 4 or Claude Sonnet 4.5?

Claude Sonnet 4 costs $3/M input; Claude Sonnet 4.5 costs $3/M input. Price spread matters at billion-token scale.

*Gateway catalog snapshot.*

### How do Claude Sonnet 4 and Claude Sonnet 4.5 context windows compare?

Claude Sonnet 4: 1,000,000 tokens. Claude Sonnet 4.5: 1,000,000 tokens.

## Methodology

o10 gateway + fulfillment catalog snapshot.

## FAQ

### Which is cheaper, Claude Sonnet 4 or Claude Sonnet 4.5?

Claude Sonnet 4 at $3/M input vs $3/M for Claude Sonnet 4.5.

### Can you run both on the same hosts?

Claude Sonnet 4: OpenRouter. Claude Sonnet 4.5: OpenRouter.

## Related links

- [Claude Sonnet 4](https://www.o10.io/models/anthropic-claude-sonnet-4)
- [Claude Sonnet 4.5](https://www.o10.io/models/anthropic-claude-sonnet-4-5)
- [All comparisons](https://www.o10.io/compare-models)
- [Model catalog](https://www.o10.io/models)

## Source URL

https://www.o10.io/compare-models/anthropic-claude-sonnet-4-vs-anthropic-claude-sonnet-4-5