Jamba Mini vs Grok 4.1 Fast
Grok 4.1 Fast comes out ahead, 71 to 57 on our weighted score, though Jamba Mini is 9% cheaper per token.
AI21 LabsJamba Mini
57/100- ECI—
- Price$0.20 / $0.40
- Context256K
- Our pick
xAIGrok 4.1 Fast
71/100- ECI—
- Price$0.20 / $0.50
- Context2M
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Make it a three-way comparison.
Grok 4.1 Fast is our pick
Grok 4.1 Fast is the better all-round choice, scoring 71/100 against Jamba Mini (57). It leads on inputs & features and context window. Jamba Mini wins 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 priceJamba MiniJamba Mini $0.25 · Grok 4.1 Fast $0.275 per 1M tokens (3:1 blend)
- Longest contextGrok 4.1 FastGrok 4.1 Fast 2,000,000 · Jamba Mini 256,000 tokens
- Widest inputsGrok 4.1 FastJamba Mini: Text · Grok 4.1 Fast: Text, Images
- Self-hostingJamba MiniPublishes downloadable weights
| Measure | Weight | Jamba Mini | Grok 4.1 Fast |
|---|---|---|---|
| Price | 50% | 78 | 76 |
| Inputs & features | 30% | 35 | 60 |
| Context window | 20% | 36 | 72 |
| Overall | 100% | 57/100 | 71/100 |
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 | Jamba MiniAI21 Labs | Grok 4.1 FastxAI |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $0.20 | $0.20 |
| Output | $0.40 (best) | $0.50 |
| Cached input | — | — |
| Blended (3:1) | $0.25 (best) | $0.275 |
| Long-context rate | Same rate | Same rate |
| Price source | Official AI21 Labs API | Median of 2 providers |
| Limits | ||
| Context window | 256,000 tokens | 2,000,000 tokens (best) |
| Max output | 4,096 tokens | 30,000 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | No | Yes |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | No | No |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Open | Proprietary |
| API model ID | jamba-mini | — |
| API providers | 1 | 2 (best) |
| Released | Jan 1, 2026 | Nov 19, 2025 |
| Knowledge cutoff | Aug 22, 2024 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Jamba Mini$2.80
- Grok 4.1 Fast$3.00
Which should you choose?
Which is better: Jamba Mini or Grok 4.1 Fast?
Grok 4.1 Fast is the better all-round choice, scoring 71/100 against Jamba Mini (57). It leads on inputs & features and context window. Jamba Mini wins 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, Jamba Mini or Grok 4.1 Fast?
Jamba Mini is cheaper at $0.20 input / $0.40 output per million tokens (official AI21 Labs API price). Grok 4.1 Fast costs $0.20 input / $0.50 output per million tokens (median across 2 API providers). At a typical mix of three input tokens to one output token, that is $0.25 per million tokens for Jamba Mini versus $0.275 for Grok 4.1 Fast (1.1× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Jamba Mini has not been scored yet and Grok 4.1 Fast has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Jamba Mini and Grok 4.1 Fast 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 has the largest context window at 2,000,000 tokens, against 256,000 for Jamba Mini. Maximum output per response: Jamba Mini up to 4,096, Grok 4.1 Fast up to 30,000 tokens.
Which can read images, PDFs, audio or video?
Jamba Mini accepts text; Grok 4.1 Fast accepts text and images. Grok 4.1 Fast handles the widest range of inputs.
Are any of these open source?
Jamba Mini publishes its weights and can be self-hosted; Grok 4.1 Fast is proprietary.
Which is newer?
Jamba Mini is the newest, released Jan 1, 2026. Grok 4.1 Fast came out Nov 19, 2025. Knowledge cutoff: Jamba Mini Aug 22, 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.
