Stepfun Step 5 Preview (LLM): On AA Pareto frontier
6 hours ago
- Step 5 Preview is a leading reasoning model with strong intelligence and competitive pricing.
- It supports text and image input, outputs text, and has a 1M token context window.
- Scores 44 on the Artificial Analysis Intelligence Index, well above the median of 25 for similar models.
- Pricing is $1.00 per 1M input tokens and $2.70 per 1M output tokens, both below market medians.
- The model generated 160M output tokens during evaluation, indicating high verbosity.
- It is proprietary, with 600 billion parameters, and supports multimodal input (text and images).
- Released on September 18, 2026, by StepFun, and available via API through one provider.