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Compare performance benchmarks, coding intelligence, reasoning evaluations, context limits, and API economics between Step 5 Preview (StepFun) and Ling 3.1 Flash (InclusionAI).
| Metric / Capability | Step 5 Preview | Ling 3.1 Flash |
|---|---|---|
| Developer / Organization | StepFun | InclusionAI |
| Release Date | 2026-10-08 | 2026-10-02 |
| Deployment / Weights | Open Weights | Proprietary Cloud API |
| Context Window | 1.0M tokens (1,048,576 tokens) | 262K tokens (262,144 tokens) |
| Input Pricing (/1M Tokens) | Free (Open Weights) | $0.075 |
| Output Pricing (/1M Tokens) | Free (Open Weights) | $0.225 |
| Benchmark / Domain | Step 5 Preview | Ling 3.1 Flash | Advantage |
|---|---|---|---|
Artificial Analysis Intelligence Index Composite index aggregating 10+ evaluations of general reasoning and knowledge. | 43.7% | 41.1% | Step 5 Preview (+6%) |
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% | — | — |
SWE-bench Pro Harder, contamination-resistant successor to SWE-bench spanning multiple languages. | — | 68.7% | — |
Terminal-Bench 4.0 Sandboxed command-line tasks requiring shell and file-system operation. | 33.3% | 46.0% | Ling 3.1 Flash (+38%) |
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% | 37.4% | Step 5 Preview (+24%) |
Step 5 Preview leads across 2 evaluated benchmarks compared to 1 for Ling 3.1 Flash, showing notable advantages in Artificial Analysis Intelligence Index, Humanity's Last Exam.
Step 5 Preview offers a larger context capacity of 1.0M tokens (1,048,576 tokens), compared to 262K tokens for Ling 3.1 Flash.
Step 5 Preview is more cost-effective. Input tokens cost $Free (Open Weights)/M tokens vs $0.075/M tokens for Ling 3.1 Flash.
Step 5 Preview is an open-weights model. Ling 3.1 Flash is a proprietary cloud API.
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