Qwen 2.5 72B Instruct vs Qwen3.5 Flash. Price, context, routing

Source page: https://www.o10.io/compare-models/qwen-qwen-2-5-72b-instruct-vs-qwen3.5-flash

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.

# Qwen 2.5 72B Instruct vs Qwen3.5 Flash. Price, context, routing

Qwen3.5 Flash is cheaper at $0.1/M input vs $0.9/M input for Qwen 2.5 72B Instruct. Compare context, hosts, and o10 routing bands.

## Key takeaways

### Which is cheaper, Qwen 2.5 72B Instruct or Qwen3.5 Flash?

Qwen 2.5 72B Instruct lists at $0.9/M input; Qwen3.5 Flash lists at $0.1/M input. Price spread matters at billion-token scale.

*Gateway catalog snapshot.*

### How do Qwen 2.5 72B Instruct and Qwen3.5 Flash context windows compare?

Qwen 2.5 72B Instruct: 128,000 tokens. Qwen3.5 Flash: 1,000,000 tokens.

### When should you pick Qwen 2.5 72B Instruct over Qwen3.5 Flash?

Pick Qwen 2.5 72B Instruct (band C1) when evals need that class. Pick Qwen3.5 Flash (band C2) when it clears the same floor cheaper.

## Methodology

o10 gateway + fulfillment catalog snapshot.

## FAQ

### Which is cheaper, Qwen 2.5 72B Instruct or Qwen3.5 Flash?

Qwen3.5 Flash at $0.1/M input vs $0.9/M for Qwen 2.5 72B Instruct.

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

Qwen 2.5 72B Instruct: OpenRouter. Qwen3.5 Flash: Alibaba DashScope.

## Related links

- [Qwen 2.5 72B Instruct](https://www.o10.io/models/qwen-qwen-2-5-72b-instruct)
- [Qwen3.5 Flash](https://www.o10.io/models/qwen3.5-flash)
- [All comparisons](https://www.o10.io/compare-models)
- [Model catalog](https://www.o10.io/models)

## Source URL

https://www.o10.io/compare-models/qwen-qwen-2-5-72b-instruct-vs-qwen3.5-flash