Ember-1 vs Step 5 Preview
Specs, per-token pricing, and live benchmark scores — refreshed daily from our benchmark database.
Specs & pricing
| Ember-1 | Step 5 Preview | |
|---|---|---|
| Company | Fireworks Ai | StepFun |
| Released | Sep 2026 | Oct 2026 |
| Context window | 1.0M | 1.0M |
| Input /1M tokens | $3 | $1 |
| Output /1M tokens | $15 | $2.7 |
| Open weights | No | No |
Benchmarks
| Benchmark | Ember-1 | Step 5 Preview |
|---|---|---|
| SWE-bench Verified | 92.2% | — |
| Speed (tok/s) | 43 tok/s | — |
Scores come from published leaderboards and official model cards (sources listed on the benchmarks page) and refresh daily. Pricing via vendor pages and OpenRouter.