Apertus 70B vs GPT-5.1 Codex mini
GPT-5.1 Codex mini comes out ahead, 59 to 33 on our weighted score, and it is the cheaper option too.
Swiss AI
Apertus 70B
33/100- ECI—
- Price$0.82 / $2.42
- Context66K
- Our pick
OpenAIGPT-5.1 Codex mini
59/100- ECI—
- Price$0.25 / $2.00
- Context400K
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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 Apertus 70B (33). 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 · Apertus 70B $1.22 per 1M tokens (3:1 blend)
- Longest contextGPT-5.1 Codex miniGPT-5.1 Codex mini 400,000 · Apertus 70B 65,536 tokens
- Widest inputsGPT-5.1 Codex miniApertus 70B: Text · GPT-5.1 Codex mini: Text, Images
- Self-hostingApertus 70BPublishes downloadable weights (Apache-2.0)
| Measure | Weight | Apertus 70B | GPT-5.1 Codex mini |
|---|---|---|---|
| Price | 50% | 46 | 58 |
| Inputs & features | 30% | 25 | 70 |
| Context window | 20% | 12 | 44 |
| Overall | 100% | 33/100 | 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 | Apertus 70BSwiss AI | GPT-5.1 Codex miniOpenAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.82 | $0.25 (best) |
| Output | $2.42 | $2.00 (best) |
| Cached input | — | — |
| Blended (3:1) | $1.22 | $0.688 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 3 providers | Median of 10 providers |
| Limits | ||
| Context window | 65,536 tokens | 400,000 tokens (best) |
| Max output | 8,192 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 | OpenApache-2.0 | Proprietary |
| API model ID | — | — |
| API providers | 3 | 10 (best) |
| Released | Sep 2, 2025 | Nov 13, 2025 |
| Knowledge cutoff | Sep 2025 | 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.
- Apertus 70B$13.04
- GPT-5.1 Codex mini$6.50
Which should you choose?
Which is better: Apertus 70B or GPT-5.1 Codex mini?
GPT-5.1 Codex mini is the better all-round choice, scoring 59/100 against Apertus 70B (33). 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, Apertus 70B 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). Apertus 70B costs $0.82 input / $2.42 output per million tokens (median across 3 API providers). 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 $1.22 for Apertus 70B (1.8× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Apertus 70B 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 Apertus 70B 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 65,536 for Apertus 70B. Maximum output per response: Apertus 70B up to 8,192, GPT-5.1 Codex mini up to 128,000 tokens.
Which can read images, PDFs, audio or video?
Apertus 70B 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?
Apertus 70B publishes its weights (Apache-2.0) and can be self-hosted; GPT-5.1 Codex mini is proprietary.
Which is newer?
GPT-5.1 Codex mini is the newest, released Nov 13, 2025. Apertus 70B came out Sep 2, 2025. Knowledge cutoff: Apertus 70B Sep 2025, 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.
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