Grok 4.1 Fast vs Grok 4 Fast Non Reasoning
Grok 4 Fast Non Reasoning comes out ahead, 72 to 66 on our weighted score.
xAIGrok 4.1 Fast
66/100- ECI—
- Price$0.20 / $0.50
- Context2M
- Our pickxAI
Grok 4 Fast Non Reasoning
72/100- ECI—
- Price$0.20 / $0.50
- Context2M
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Make it a three-way comparison.
Grok 4 Fast Non Reasoning is our pick
Grok 4 Fast Non Reasoning is the better all-round choice, scoring 72/100 against Grok 4.1 Fast (66). It leads on inputs & features. 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 priceSame priceGrok 4.1 Fast $0.275 · Grok 4 Fast Non Reasoning $0.275 per 1M tokens (3:1 blend)
- Longest contextAbout the sameGrok 4.1 Fast 2,000,000 · Grok 4 Fast Non Reasoning 2,000,000 tokens
- Widest inputsGrok 4 Fast Non ReasoningGrok 4.1 Fast: Text, Images · Grok 4 Fast Non Reasoning: Text, Images, Audio, Video
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Grok 4.1 Fast | Grok 4 Fast Non Reasoning |
|---|---|---|---|
| Price | 50% | 73 | 73 |
| Inputs & features | 30% | 50 | 70 |
| Context window | 20% | 72 | 72 |
| Overall | 100% | 66/100 | 72/100 |
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 | Grok 4.1 FastxAI | Grok 4 Fast Non ReasoningxAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.20 | $0.20 |
| Output | $0.50 | $0.50 |
| Cached input | — | — |
| Blended (3:1) | $0.275 | $0.275 |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 6 providers | Median of 7 providers |
| Limits | ||
| Context window | 2,000,000 tokens | 2,000,000 tokens |
| Max output | 30,000 tokens | 2,000,000 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | No | No |
| Audio | No | Yes |
| Video | No | Yes |
| Reasoning | No | No |
| Tool calling | Yes | Yes |
| Structured output | No | No |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | — | — |
| API providers | 8 | 8 |
| Released | Nov 19, 2025 | Dec 18, 2025 |
| Knowledge cutoff | — | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Grok 4.1 Fast$3.00
- Grok 4 Fast Non Reasoning$3.00
Which should you choose?
Which is better: Grok 4.1 Fast or Grok 4 Fast Non Reasoning?
Grok 4 Fast Non Reasoning is the better all-round choice, scoring 72/100 against Grok 4.1 Fast (66). It leads on inputs & features. 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, Grok 4.1 Fast or Grok 4 Fast Non Reasoning?
Grok 4.1 Fast and Grok 4 Fast Non Reasoning cost the same: $0.20 input / $0.50 output per million tokens.
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Grok 4.1 Fast has not been scored yet and Grok 4 Fast Non Reasoning has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Grok 4.1 Fast and Grok 4 Fast Non Reasoning 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?
Grok 4.1 Fast and Grok 4 Fast Non Reasoning share the same 2,000,000-token context window. Maximum output per response: Grok 4.1 Fast up to 30,000, Grok 4 Fast Non Reasoning up to 2,000,000 tokens.
Which can read images, PDFs, audio or video?
Grok 4.1 Fast accepts text and images; Grok 4 Fast Non Reasoning accepts text, images, audio and video. Grok 4 Fast Non Reasoning handles the widest range of inputs.
Are any of these open source?
No. Grok 4.1 Fast and Grok 4 Fast Non Reasoning are proprietary and only available through APIs and apps.
Which is newer?
Grok 4 Fast Non Reasoning is the newest, released Dec 18, 2025. Grok 4.1 Fast came out Nov 19, 2025.
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 Nov 2, 2026.
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