Claude Fable 5.1 vs MiMo-V2.6-Pro-UltraSpeed vs Qwen 3.8 Max Prime
Too close to call on our weighted score (MiMo-V2.6-Pro-UltraSpeed 44, Qwen 3.8 Max Prime 42, Claude Fable 5.1 36). The right pick depends on what you value most.
AnthropicClaude Fable 5.1
36/100- ECI164.8
- Price$10.00 / $50.00
- Context1M
XiaomiMiMo-V2.6-Pro-UltraSpeed
44/100- ECI—
- Price$4.35 / $8.70
- Context1.05M
Alibaba (Qwen)Qwen 3.8 Max Prime
42/100- ECI—
- Price$4.00 / $12.00
- Context1M
Too close to call
It is close. Our weighted score puts them within 1 points (MiMo-V2.6-Pro-UltraSpeed 44/100, Qwen 3.8 Max Prime 42/100, Claude Fable 5.1 36/100), so choose by what matters most for your work: MiMo-V2.6-Pro-UltraSpeed on price and MiMo-V2.6-Pro-UltraSpeed for long inputs. 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 · Qwen 3.8 Max Prime $6.00 · Claude Fable 5.1 $20.00 per 1M tokens (3:1 blend)
- Longest contextMiMo-V2.6-Pro-UltraSpeedMiMo-V2.6-Pro-UltraSpeed 1,048,576 · Claude Fable 5.1 1,000,000 · Qwen 3.8 Max Prime 1,000,000 tokens
- Widest inputsMiMo-V2.6-Pro-UltraSpeedClaude Fable 5.1: Text, Images, PDFs · MiMo-V2.6-Pro-UltraSpeed: Text, Images, Audio, Video · Qwen 3.8 Max Prime: Text, Images, Video
- Self-hostingMiMo-V2.6-Pro-UltraSpeedPublishes downloadable weights
| Measure | Weight | Claude Fable 5.1 | MiMo-V2.6-Pro-UltraSpeed | Qwen 3.8 Max Prime |
|---|---|---|---|---|
| Price | 50% | 0 | 15 | 13 |
| Inputs & features | 30% | 80 | 80 | 80 |
| Context window | 20% | 60 | 61 | 60 |
| Overall | 100% | 36/100 | 44/100 | 42/100 |
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 | Claude Fable 5.1Anthropic | MiMo-V2.6-Pro-UltraSpeedXiaomi | Qwen 3.8 Max PrimeAlibaba (Qwen) |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 164.8 | — | — |
| ECI rank | #4 of 148 | — | — |
| FrontierMath Tiers 1–3Research-level mathematics | 90.2% | — | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 100% | — | — |
| SimpleQA VerifiedShort factual questions | 70.8% | — | — |
| Price per million tokens | |||
| Input | $10.00 | $4.35 | $4.00 (best) |
| Output | $50.00 | $8.70 (best) | $12.00 |
| Cached input | $0.25 | $0.036 (best) | — |
| Blended (3:1) | $20.00 | $5.44 (best) | $6.00 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Anthropic API | Official Xiaomi API | Median of 4 providers |
| Limits | |||
| Context window | 1,000,000 tokens | 1,048,576 tokens (best) | 1,000,000 tokens |
| Max output | 128,000 tokens | 131,072 tokens (best) | 131,072 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | No | No |
| Audio | No | Yes | No |
| Video | No | Yes | Yes |
| Reasoning | Yeslow · medium · high · xhigh · max | Yes | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | Yes |
| Availability | |||
| Weights | Proprietary | Open | Proprietary |
| API model ID | claude-fable-5-1 | mimo-v2.6-pro-ultraspeed | — |
| API providers | 29 (best) | 9 | 4 |
| Released | Sep 1, 2026 | Sep 21, 2026 | Sep 23, 2026 |
| Knowledge cutoff | Jun 2026 | — | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Claude Fable 5.1$200.00
- MiMo-V2.6-Pro-UltraSpeed$60.90
- Qwen 3.8 Max Prime$64.00
Which should you choose?
Which is better: Claude Fable 5.1, MiMo-V2.6-Pro-UltraSpeed or Qwen 3.8 Max Prime?
It is close. Our weighted score puts them within 1 points (MiMo-V2.6-Pro-UltraSpeed 44/100, Qwen 3.8 Max Prime 42/100, Claude Fable 5.1 36/100), so choose by what matters most for your work: MiMo-V2.6-Pro-UltraSpeed on price and MiMo-V2.6-Pro-UltraSpeed for long inputs. 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, Claude Fable 5.1, MiMo-V2.6-Pro-UltraSpeed or Qwen 3.8 Max Prime?
MiMo-V2.6-Pro-UltraSpeed is cheaper at $4.35 input / $8.70 output per million tokens (official Xiaomi API price). Qwen 3.8 Max Prime costs $4.00 input / $12.00 output per million tokens (median across 4 API providers); Claude Fable 5.1 costs $10.00 input / $50.00 output per million tokens (official Anthropic 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 $6.00 for Qwen 3.8 Max Prime (1.1× as much) and $20.00 for Claude Fable 5.1 (3.7× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Claude Fable 5.1 has an ECI of 164.8, MiMo-V2.6-Pro-UltraSpeed has not been scored yet and Qwen 3.8 Max Prime has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Claude Fable 5.1, MiMo-V2.6-Pro-UltraSpeed and Qwen 3.8 Max Prime yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
MiMo-V2.6-Pro-UltraSpeed has the largest context window at 1,048,576 tokens, against 1,000,000 for Claude Fable 5.1 and 1,000,000 for Qwen 3.8 Max Prime. Maximum output per response: Claude Fable 5.1 up to 128,000, MiMo-V2.6-Pro-UltraSpeed up to 131,072, Qwen 3.8 Max Prime up to 131,072 tokens.
Which can read images, PDFs, audio or video?
Claude Fable 5.1 accepts text, images and PDFs; MiMo-V2.6-Pro-UltraSpeed accepts text, images, audio and video; Qwen 3.8 Max Prime accepts text, images 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; Claude Fable 5.1 and Qwen 3.8 Max Prime is proprietary.
Which is newer?
Qwen 3.8 Max Prime is the newest, released Sep 23, 2026. MiMo-V2.6-Pro-UltraSpeed came out Sep 21, 2026; Claude Fable 5.1 came out Sep 1, 2026. Knowledge cutoff: Claude Fable 5.1 Jun 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.
