GPT-6 Astra vs MiMo-V2.6-Pro-UltraSpeed
MiMo-V2.6-Pro-UltraSpeed comes out ahead, 44 to 36 on our weighted score, and it is the cheaper option too.
OpenAIGPT-6 Astra
36/100- ECI166.5
- Price$10.00 / $50.00
- Context1.05M
- Our pick
XiaomiMiMo-V2.6-Pro-UltraSpeed
44/100- ECI—
- Price$4.35 / $8.70
- Context1.05M
Add a model
Make it a three-way comparison.
MiMo-V2.6-Pro-UltraSpeed is our pick
MiMo-V2.6-Pro-UltraSpeed is the better all-round choice, scoring 44/100 against GPT-6 Astra (36). It leads on price. 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 priceMiMo-V2.6-Pro-UltraSpeedMiMo-V2.6-Pro-UltraSpeed $5.44 · GPT-6 Astra $20.00 per 1M tokens (3:1 blend)
- Longest contextAbout the sameGPT-6 Astra 1,050,000 · MiMo-V2.6-Pro-UltraSpeed 1,048,576 tokens
- Widest inputsMiMo-V2.6-Pro-UltraSpeedGPT-6 Astra: Text, Images, PDFs · MiMo-V2.6-Pro-UltraSpeed: Text, Images, Audio, Video
- Self-hostingMiMo-V2.6-Pro-UltraSpeedPublishes downloadable weights
| Measure | Weight | GPT-6 Astra | MiMo-V2.6-Pro-UltraSpeed |
|---|---|---|---|
| Price | 50% | 0 | 15 |
| Inputs & features | 30% | 80 | 80 |
| Context window | 20% | 61 | 61 |
| Overall | 100% | 36/100 | 44/100 |
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 | GPT-6 AstraOpenAI | MiMo-V2.6-Pro-UltraSpeedXiaomi |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | 166.5 | — |
| ECI rank | #2 of 148 | — |
| GPQA DiamondGraduate-level science questions | 95.8% | — |
| FrontierMath Tiers 1–3Research-level mathematics | 93.7% | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 100% | — |
| SimpleQA VerifiedShort factual questions | 75.6% | — |
| Price per million tokens | ||
| Input | $10.00 | $4.35 (best) |
| Output | $50.00 | $8.70 (best) |
| Cached input | $1.00 | $0.036 (best) |
| Blended (3:1) | $20.00 | $5.44 (best) |
| Long-context rate | Over 272K: $20.00 / $75.00 | Same rate |
| Price source | Official OpenAI API | Official Xiaomi API |
| Limits | ||
| Context window | 1,050,000 tokens (best) | 1,048,576 tokens |
| Max output | 128,000 tokens | 131,072 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | Yes | No |
| Audio | No | Yes |
| Video | No | Yes |
| Reasoning | Yeslow · medium · high · xhigh · max | Yes |
| Tool calling | Yes | Yes |
| Structured output | Yes | No |
| Availability | ||
| Weights | Proprietary | Open |
| API model ID | gpt-6-astra | mimo-v2.6-pro-ultraspeed |
| API providers | 26 (best) | 9 |
| Released | Sep 4, 2026 | Sep 21, 2026 |
| Knowledge cutoff | Apr 30, 2026 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-6 Astra$200.00
- MiMo-V2.6-Pro-UltraSpeed$60.90
Which should you choose?
Which is better: GPT-6 Astra or MiMo-V2.6-Pro-UltraSpeed?
MiMo-V2.6-Pro-UltraSpeed is the better all-round choice, scoring 44/100 against GPT-6 Astra (36). It leads on price. 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, GPT-6 Astra or MiMo-V2.6-Pro-UltraSpeed?
MiMo-V2.6-Pro-UltraSpeed is cheaper at $4.35 input / $8.70 output per million tokens (official Xiaomi API price). GPT-6 Astra costs $10.00 input / $50.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $5.44 per million tokens for MiMo-V2.6-Pro-UltraSpeed versus $20.00 for GPT-6 Astra (3.7× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. GPT-6 Astra has an ECI of 166.5 and MiMo-V2.6-Pro-UltraSpeed has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-6 Astra and MiMo-V2.6-Pro-UltraSpeed 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?
Their context windows are effectively the same size: GPT-6 Astra 1,050,000 and MiMo-V2.6-Pro-UltraSpeed 1,048,576 tokens. Maximum output per response: GPT-6 Astra up to 128,000, MiMo-V2.6-Pro-UltraSpeed up to 131,072 tokens.
Which can read images, PDFs, audio or video?
GPT-6 Astra accepts text, images and PDFs; MiMo-V2.6-Pro-UltraSpeed accepts text, images, audio and video. MiMo-V2.6-Pro-UltraSpeed handles the widest range of inputs.
Are any of these open source?
MiMo-V2.6-Pro-UltraSpeed publishes its weights and can be self-hosted; GPT-6 Astra is proprietary.
Which is newer?
MiMo-V2.6-Pro-UltraSpeed is the newest, released Sep 21, 2026. GPT-6 Astra came out Sep 4, 2026. Knowledge cutoff: GPT-6 Astra Apr 30, 2026.
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.
