Quality
Known Good Index and the capability indices, side by side
Each index is min-max normalised across tracked models and scaled 0–100 from published evaluations. We do not run these evaluations.
| Metric | Google: Gemini 2.5 Pro | Google: Gemini 3.1 Pro Preview |
|---|---|---|
| Known Good Index | 64 | 96 |
| Coding Index | 42 | — |
| Mathematics Index | 84 | 96 |
| Science Index | 89 | 99 |
| Reasoning Index | — | 100 |
| Agentic Index | 42 | 88 |
| Openness Index | 5 | 5 |
Quality Breakdown
Every evaluation both models report a published score for
Bar = Google: Gemini 2.5 Pro · marker = Google: Gemini 3.1 Pro Preview · scores ingested from Epoch AI (CC-BY 4.0)
Right-hand figures read Google: Gemini 2.5 Pro / Google: Gemini 3.1 Pro Preview. Google: Gemini 2.5 Pro leads on 0 of 3, Google: Gemini 3.1 Pro Preview on 3.
Arena Elo
Human preference rating from blind pairwise votes
Elo from blind pairwise votes, ingested from Arena. Higher is better.
| Metric | Google: Gemini 2.5 Pro | Google: Gemini 3.1 Pro Preview |
|---|---|---|
| Text Arena | 1,457 | 1,479 |
| Text Arena (style controlled) | 1,446 | 1,486 |
Price & Cost
Published API pricing by token type
USD per 1M tokens. Blended is a 3:1 input:output mix. Live from OpenRouter, cross-checked against models.dev. Lower is better.
| Metric | Google: Gemini 2.5 Pro | Google: Gemini 3.1 Pro Preview |
|---|---|---|
| Input $/1M | $1.25 | $2.00 |
| Output $/1M | $10.00 | $12.00 |
| Blended $/1M | $3.44 | $4.50 |
| Cache read $/1M | $0.125 | $0.200 |
Context Window
Maximum input accepted and maximum output emitted
Provider-declared limits, from metadata via models.dev and OpenRouter. Higher is better.
| Metric | Google: Gemini 2.5 Pro | Google: Gemini 3.1 Pro Preview |
|---|---|---|
| Context window | 1.05M | 1.05M |
| Max output tokens | 66k | 66k |
Speed & Latency
Median throughput and time to first token across hosting providers
Medians across all tracked providers, derived from OpenRouter endpoint telemetry.
| Metric | Google: Gemini 2.5 Pro | Google: Gemini 3.1 Pro Preview |
|---|---|---|
| Output tokens/s | 96 | 104 |
| Time to first token | 5.4s | 2.9s |
Providers
Which hosts serve each model, and at what price and speed
| Provider | Google: Gemini 2.5 Pro blended | Google: Gemini 2.5 Pro tok/s | Google: Gemini 3.1 Pro Preview blended | Google: Gemini 3.1 Pro Preview tok/s |
|---|---|---|---|---|
| Google AI Studio | $1.72 | 118 | $2.25 | 163 |
| Google · first party | $1.72 | 99 | $2.25 | 99 |
Per-host pricing and telemetry from OpenRouter. A dash means that host does not serve that model.