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Compare performance benchmarks, coding intelligence, reasoning evaluations, context limits, and API economics between Qwen3.8 Flash (Alibaba) and Step 5 Preview (StepFun).
| Metric / Capability | Qwen3.8 Flash | Step 5 Preview |
|---|---|---|
| Developer / Organization | Alibaba | StepFun |
| Release Date | 2026-08-26 | 2026-10-08 |
| Deployment / Weights | Open Weights | Open Weights |
| Context Window | 1M tokens (1,000,000 tokens) | 1.0M tokens (1,048,576 tokens) |
| Input Pricing (/1M Tokens) | Free (Open Weights) | Free (Open Weights) |
| Output Pricing (/1M Tokens) | Free (Open Weights) | Free (Open Weights) |
| Benchmark / Domain | Qwen3.8 Flash | Step 5 Preview | Advantage |
|---|---|---|---|
Artificial Analysis Intelligence Index Composite index aggregating 10+ evaluations of general reasoning and knowledge. | — | 43.7% | — |
Artificial Analysis Coding Agent Index v2.0 Composite index of coding-agent systems (model + harness) across FrontierCode v1.1, SWE-Atlas-QnA, and Terminal-Bench v4. | — | 43.1% | — |
Terminal-Bench 4.0 Sandboxed command-line tasks requiring shell and file-system operation. | — | 33.3% | — |
GPQA Diamond Graduate-level physics, chemistry, and biology questions written by domain experts. | — | 93.5% | — |
Humanity's Last Exam Expert-written questions across hundreds of disciplines designed to resist saturation. | — | 46.5% | — |
Both models perform neck-and-neck across available benchmarks, with Qwen3.8 Flash and Step 5 Preview each excelling in distinct tasks.
Step 5 Preview has the larger context capacity of 1.0M tokens (1,048,576 tokens), compared to 1M tokens for Qwen3.8 Flash.
Both models have comparable pricing structures or open weight deployment options.
Qwen3.8 Flash is an open-weights model. Step 5 Preview is an open-weights model.
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