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