Grok 4.1 Fast vs Jamba Mini vs Solar Pro 3
Grok 4.1 Fast comes out ahead, 71 to 57 and 55 on our weighted score, though Jamba Mini is 9% cheaper per token.
- Our pick
xAIGrok 4.1 Fast
71/100- ECI—
- Price$0.20 / $0.50
- Context2M
AI21 LabsJamba Mini
57/100- ECI—
- Price$0.20 / $0.40
- Context256K
Upstage
Solar Pro 3
55/100- ECI—
- Price$0.25 / $0.25
- Context131K
Grok 4.1 Fast is our pick
Grok 4.1 Fast is the better all-round choice, scoring 71/100 against Jamba Mini (57) and Solar Pro 3 (55). It leads on 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 priceJamba Mini and Solar Pro 3Jamba Mini $0.25 · Solar Pro 3 $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 · Solar Pro 3 131,072 tokens
- Widest inputsGrok 4.1 FastGrok 4.1 Fast: Text, Images · Jamba Mini: Text · Solar Pro 3: Text
- Self-hostingJamba MiniPublishes downloadable weights
| Measure | Weight | Grok 4.1 Fast | Jamba Mini | Solar Pro 3 |
|---|---|---|---|---|
| Price | 50% | 76 | 78 | 78 |
| Inputs & features | 30% | 60 | 35 | 35 |
| Context window | 20% | 72 | 36 | 24 |
| Overall | 100% | 71/100 | 57/100 | 55/100 |
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 | Jamba MiniAI21 Labs | Solar Pro 3Upstage |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | $0.20 (best) | $0.20 (best) | $0.25 |
| Output | $0.50 | $0.40 | $0.25 (best) |
| Cached input | — | — | — |
| Blended (3:1) | $0.275 | $0.25 (best) | $0.25 (best) |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 2 providers | Official AI21 Labs API | Official Upstage API |
| Limits | |||
| Context window | 2,000,000 tokens (best) | 256,000 tokens | 131,072 tokens |
| Max output | 30,000 tokens (best) | 4,096 tokens | 8,192 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | No | No |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | No | No | Yeslow · medium · high |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | No |
| Availability | |||
| Weights | Proprietary | Open | Proprietary |
| API model ID | — | jamba-mini | solar-pro3 |
| API providers | 2 (best) | 1 | 2 (best) |
| Released | Nov 19, 2025 | Jan 1, 2026 | Jan 2026 |
| Knowledge cutoff | — | Aug 22, 2024 | Mar 2025 |
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
- Jamba Mini$2.80
- Solar Pro 3$3.00
Which should you choose?
Which is better: Grok 4.1 Fast, Jamba Mini or Solar Pro 3?
Grok 4.1 Fast is the better all-round choice, scoring 71/100 against Jamba Mini (57) and Solar Pro 3 (55). It leads on 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, Grok 4.1 Fast, Jamba Mini or Solar Pro 3?
Jamba Mini is cheaper at $0.20 input / $0.40 output per million tokens (official AI21 Labs API price). Solar Pro 3 costs $0.25 input / $0.25 output per million tokens (official Upstage 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 $0.25 for Solar Pro 3 (1× as much) and $0.275 for Grok 4.1 Fast (1.1× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Grok 4.1 Fast has not been scored yet, Jamba Mini has not been scored yet and Solar Pro 3 has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Grok 4.1 Fast, Jamba Mini and Solar Pro 3 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?
Grok 4.1 Fast has the largest context window at 2,000,000 tokens, against 256,000 for Jamba Mini and 131,072 for Solar Pro 3. Maximum output per response: Grok 4.1 Fast up to 30,000, Jamba Mini up to 4,096, Solar Pro 3 up to 8,192 tokens.
Which can read images, PDFs, audio or video?
Grok 4.1 Fast accepts text and images; Jamba Mini accepts text; Solar Pro 3 accepts text. 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 and Solar Pro 3 is proprietary.
Which is newer?
Jamba Mini is the newest, released Jan 1, 2026. Solar Pro 3 came out Jan 2026; Grok 4.1 Fast came out Nov 19, 2025. Knowledge cutoff: Jamba Mini Aug 22, 2024, Solar Pro 3 Mar 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 Oct 4, 2026.
