Step 1 (32K) vs GPT-5.1 Codex mini
GPT-5.1 Codex mini comes out ahead, 59 to 18 on our weighted score, and it is the cheaper option too.
StepFunStep 1 (32K)
18/100- ECI—
- Price$2.05 / $9.59
- Context33K
- Our pick
OpenAIGPT-5.1 Codex mini
59/100- ECI—
- Price$0.25 / $2.00
- Context400K
Add a model
Make it a three-way comparison.
GPT-5.1 Codex mini is our pick
GPT-5.1 Codex mini is the better all-round choice, scoring 59/100 against Step 1 (32K) (18). It leads on price, inputs & features and context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceGPT-5.1 Codex miniGPT-5.1 Codex mini $0.688 · Step 1 (32K) $3.94 per 1M tokens (3:1 blend)
- Longest contextGPT-5.1 Codex miniGPT-5.1 Codex mini 400,000 · Step 1 (32K) 32,768 tokens
- Widest inputsGPT-5.1 Codex miniStep 1 (32K): Text · GPT-5.1 Codex mini: Text, Images
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Step 1 (32K) | GPT-5.1 Codex mini |
|---|---|---|---|
| Price | 50% | 22 | 58 |
| Inputs & features | 30% | 25 | 70 |
| Context window | 20% | 0 | 44 |
| Overall | 100% | 18/100 | 59/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Step 1 (32K)StepFun | GPT-5.1 Codex miniOpenAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $2.05 | $0.25 (best) |
| Output | $9.59 | $2.00 (best) |
| Cached input | $0.41 | — |
| Blended (3:1) | $3.94 | $0.688 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official StepFun (Global) API | Median of 10 providers |
| Limits | ||
| Context window | 32,768 tokens | 400,000 tokens (best) |
| Max output | 32,768 tokens | 128,000 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | No | Yes |
| Tool calling | Yes | Yes |
| Structured output | No | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | step-1-32k | — |
| API providers | 1 | 10 (best) |
| Released | Jan 1, 2025 | Nov 13, 2025 |
| Knowledge cutoff | Jun 2024 | Sep 30, 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Step 1 (32K)$39.68
- GPT-5.1 Codex mini$6.50
Which should you choose?
Which is better: Step 1 (32K) or GPT-5.1 Codex mini?
GPT-5.1 Codex mini is the better all-round choice, scoring 59/100 against Step 1 (32K) (18). It leads on price, inputs & features and context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, Step 1 (32K) or GPT-5.1 Codex mini?
GPT-5.1 Codex mini is cheaper at $0.25 input / $2.00 output per million tokens (median across 10 API providers). Step 1 (32K) costs $2.05 input / $9.59 output per million tokens (official StepFun (Global) API price). At a typical mix of three input tokens to one output token, that is $0.688 per million tokens for GPT-5.1 Codex mini versus $3.94 for Step 1 (32K) (5.7× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Step 1 (32K) has not been scored yet and GPT-5.1 Codex mini has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Step 1 (32K) and GPT-5.1 Codex mini yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
GPT-5.1 Codex mini has the largest context window at 400,000 tokens, against 32,768 for Step 1 (32K). Maximum output per response: Step 1 (32K) up to 32,768, GPT-5.1 Codex mini up to 128,000 tokens.
Which can read images, PDFs, audio or video?
Step 1 (32K) accepts text; GPT-5.1 Codex mini accepts text and images. GPT-5.1 Codex mini handles the widest range of inputs.
Are any of these open source?
No. Step 1 (32K) and GPT-5.1 Codex mini are proprietary and only available through APIs and apps.
Which is newer?
GPT-5.1 Codex mini is the newest, released Nov 13, 2025. Step 1 (32K) came out Jan 1, 2025. Knowledge cutoff: Step 1 (32K) Jun 2024, GPT-5.1 Codex mini Sep 30, 2024.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
