Is Gemini 3.1 Pro Preview a good deal?
Whether anything in this catalogue beats Gemini 3.1 Pro Preview on both quality and price, and what you give up if it does. A computation on the current catalogue, not an opinion.
12 undominated of 145 · Oct 6, 2026
As of Oct 6, 2026, Gemini 3.1 Pro Preview is dominated for Balanced on LMArena. Gemini 3.8 Flash scores 16.8 higher and costs 33% less, with a covering envelope. 12 of 145 rated, priced standard models are undominated.
Inspect model evidence Compare differences & requirements
Gemini 3.8 Flash is both better and cheaper than Gemini 3.1 Pro Preview: 16.8 points higher on LMArena and 33% less per million tokens, $1.50 cheaper at this mix.
LMArena Elo · higher is better
Scale starts at 1040 Elo
1480.2
Effective $/M · Balanced · lower is better
$4.50/M
LMArena Elo · higher is better
Scale starts at 1040 Elo
1497.0
Effective $/M · Balanced · lower is better
$3.00/M
Gemini 3.1 Pro Preview takes audio, file, image, text, video, returns up to 65,536 tokens from a 1,048,576-token context, and is listed by 6 sellers.
Compared against 145 rated, priced models on this lens: 4 models dominate it and give up nothing, 1 more dominates it but gives something up. Gemini 3.1 Pro Preview scores 1480.2 at $4.50 per million tokens for this mix.
Envelope-safe replacements
Each row scores at least as high, costs no more, and covers this model’s context, output, modalities, tools, and reasoning. A cheaper narrower model is not listed here.
| Model | LMArena | Effective $/M | You save |
|---|---|---|---|
| Gemini 3.8 Flash | 1497.0 +16.8 | $3.00/M | 33% |
| Muse Spark 1.3 | 1489.9 +9.7 | $2.00/M | 56% |
| Gemini 3.7 Flash | 1487.0 +6.8 | $3.00/M | 33% |
| Muse Spark 1.2 | 1483.2 +3.0 | $2.00/M | 56% |
Higher score, lower price, named losses
Not a drop-in. The loss is why these are not a recommendation.
| Model | LMArena | Effective $/M | You give up |
|---|---|---|---|
| MiMo-V2.6-Pro | 1491.0 | $0.540/M | file |
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Constraint: replacements must preserve the model’s capabilities; any losses remain named trade-offs.
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