Qwen3.5 Flash vs Qwen3.7 Flash

What are we comparing?

Qwen3.5 Flash and Qwen3.7 Flash are two budget models, built for high volumes at a low price, both built by Alibaba Cloud (Qwen). Qwen3.5 Flash was released on February 23, 2026, Qwen3.7 Flash on July 15, 2026.

All figures below come from public sources checked on October 22, 2026: models.dev and OpenRouter for prices and capabilities, Epoch AI for scores.

Performance

On our capability index, Qwen3.5 Flash scores 62.6 out of 100 and Qwen3.7 Flash 63.7. Qwen3.7 Flash leads by 1.1 points.

On the 3 benchmarks reported for both, Qwen3.5 Flash wins 0 times and Qwen3.7 Flash 2:

• GPQA Diamond (PhD-level science questions): Qwen3.5 Flash 82.3%, Qwen3.7 Flash 82.3%
• OTIS Mock AIME (competition mathematics problems): Qwen3.5 Flash 84.4%, Qwen3.7 Flash 86.7%
• FrontierMath (very hard research-level mathematics): Qwen3.5 Flash 18.2%, Qwen3.7 Flash 19.3%

Which one costs less?

Qwen3.5 Flash costs $0.10 per million input tokens and $0.40 per million output tokens; Qwen3.7 Flash costs $0.03 and $0.13.

For a typical agent task (read 20,000 tokens, write 2,000), expect $0.003 with Qwen3.5 Flash versus $0.001 with Qwen3.7 Flash. Qwen3.7 Flash is 3.3 times cheaper, a gap that adds up quickly over 1,000 tasks: $1.94 difference.

Run the numbers with your own volumes in the agent cost calculator.

Under the hood

Both models have the same context window: 1,000,000 tokens, roughly 1,500 pages.

Reasoning mode: Qwen3.5 Flash yes, Qwen3.7 Flash yes. Tool calling: Qwen3.5 Flash yes, Qwen3.7 Flash yes. Image input: Qwen3.5 Flash yes, Qwen3.7 Flash yes.

Neither publishes its weights: both are used through an API.

In short

Our reading of the data:

• Choose Qwen3.7 Flash for a higher capability index, a lower cost and a more recent release.

This verdict relies on public figures; it does not replace a trial on your own tasks.