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Compare performance benchmarks, coding intelligence, reasoning evaluations, context limits, and API economics between DeepSeek V4.1 Flash (DeepSeek) and Step 5 Preview (StepFun).
| Metric / Capability | DeepSeek V4.1 Flash | Step 5 Preview |
|---|---|---|
| Developer / Organization | DeepSeek | StepFun |
| Release Date | 2026-09-10 | 2026-10-08 |
| Deployment / Weights | Open Weights | Open Weights |
| Context Window | 1.0M tokens (1,048,576 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 | DeepSeek V4.1 Flash | Step 5 Preview | Advantage |
|---|---|---|---|
Artificial Analysis Intelligence Index Composite index aggregating 10+ evaluations of general reasoning and knowledge. | 24.7% | 43.7% | Step 5 Preview (+77%) |
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. | 47.3% | 43.1% | DeepSeek V4.1 Flash (+10%) |
Terminal-Bench 4.0 Sandboxed command-line tasks requiring shell and file-system operation. | 42.3% | 33.3% | DeepSeek V4.1 Flash (+27%) |
ARC-AGI-2 Novel visual grid puzzles requiring abstract rule induction. | 72.9% | — | — |
GPQA Diamond Graduate-level physics, chemistry, and biology questions written by domain experts. | 90.9% | 93.5% | Step 5 Preview (+3%) |
Humanity's Last Exam Expert-written questions across hundreds of disciplines designed to resist saturation. | — | 46.5% | — |
FrontierMath v2 (Tiers 1-3) Unpublished, research-level mathematics problems across Tiers 1-3. | 67.4% | — | — |
Both models perform neck-and-neck across available benchmarks, with DeepSeek V4.1 Flash and Step 5 Preview each excelling in distinct tasks.
Both models feature equivalent context windows of 1.0M tokens (1,048,576 tokens).
Both models have comparable pricing structures or open weight deployment options.
DeepSeek V4.1 Flash is an open-weights model. Step 5 Preview is an open-weights model.
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