Anthropic vs 
StepFun
Verdict
- Anthropic's flagship leads: Claude Opus 5.5 at 72.6 vs Step 5 Preview at 60.5.
- Anthropic has the better model in 4 of 4 price bands.
- StepFun's fastest ranked model (Step 5 Preview, 229 tok/s) beats Anthropic's (Claude Haiku 5.5, 190 tok/s).
- StepFun publishes more open-weights models (5 vs 0).
- Anthropic ships more often: one model every 39 days against every 59.
Best model per price band
Each provider’s highest-index model below the price ceiling. Purple marks the winner of the band.
| Price band | Anthropic | StepFun |
|---|---|---|
| Under $0.50/M | Claude Haiku 5.5 xhigh 61.5$0.200/M | Step 3.5 Flash 53.7$0.150/M |
| Under $2/M | Claude Haiku 5.5 xhigh 61.5$0.200/M | Step 5 Preview 60.5$1.43/M |
| Under $10/M | Claude Opus 5.5 max 72.6$8.00/M | Step 5 Preview 60.5$1.43/M |
| Any price | Claude Opus 5.5 max 72.6$8.00/M | Step 5 Preview 60.5$1.43/M |
Line-up
| Metric | Anthropic | StepFun |
|---|---|---|
| Flagship index | 72.6 | 60.5 |
| Ranked models | 23 | 7 |
| Open-weights models | 0 | 5 |
| Cheapest ranked, $/M | $0.200 | $0.150 |
| Fastest ranked, tok/s | 190 | 229 |
| Release cadence, days | 39 | 59 |
| Last release | 7 Oct 2026 | 18 Sept 2026 |
| Next expected | 30 Oct 2026 – 30 Nov 2026 | 23 Oct 2026 – 9 Dec 2026 |