Step 5 Preview vs Grok 4.7
Step 5 Preview is from StepFun, released September 20, 2026. Grok 4.7 is from SpaceXAI, released September 21, 2026.
- LMArena Elo1446 vs 1444. Step 5 Preview is 0.1% ahead on LMArena Elo.
- Input per 1M$1 vs $2. Step 5 Preview costs 50% less per million input tokens.
- Output per 1M$2.70 vs $6. Step 5 Preview costs 55% less per million output tokens.
- Context window1M vs 500k. Step 5 Preview takes 100% more context in one request.
Prices are the vendors’ published API rates; Elo is LMArena’s text board. Each figure is dated on its model page.
Interactive Comparison
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$1 / $2.70 per million tokens | $2 / $6 per million tokens | |
|---|---|---|
| Identity | ||
| Developer | StepFun | SpaceXAI |
| Released | Sep 2026 | Sep 2026 |
| Status | — | GA |
| Licence | Not yet stated (open weights announced for 15 Oct 2026) | Proprietary |
| Self-hostable | — | No |
| Cost | ||
| Blended $/1M tokensinput × 0.75 + output × 0.25 | $1.425 / 1M tokens | $3.000 / 1M tokens |
| Input price | $1.000 / 1M tokens | $2.000 / 1M tokens |
| Output price | $2.700 / 1M tokens | $6.000 / 1M tokens |
| Capacity | ||
| Context window | 1M tokens | 500k tokens |
| Max output | — | No text output limit |
| Capability | ||
| Vision in | — | Yes |
| Audio in | — | No |
| Function calling | — | Yes |
| Structured output | — | Yes |
| Extended reasoning | — | Yes |
| Web search | — | Yes |
| Code execution | — | Yes |
| Access | ||
| API | Yes | Yes |
| Chat app | — | Yes |
| Cloud marketplaces | — | Google Cloud Vertex AI, Microsoft Foundry |
| Fine-tuning | — | No |
| Measured quality | ||
| LMArena Elo | 1446 (checked Oct 2026) | 1444 (checked Oct 2026) |
| LMArena rank | Rank 86 | Rank 89 |
| GPQA Diamond | — | 93 · xhigh effort |
| Elo per dollarLMArena Elo ÷ blended $/1M tokens | 1015 | 481 |
