Gemini 2.5 Pro Preview 05-06 vs Gemini 3.1 Pro Preview
Gemini 2.5 Pro Preview 05-06 (2025) and Gemini 3.1 Pro Preview (2026) are general-purpose language models from Google DeepMind. Gemini 2.5 Pro Preview 05-06 ships a 1m-token context window, while Gemini 3.1 Pro Preview ships a 1m-token context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Gemini 3.1 Pro Preview is safer overall; choose Gemini 2.5 Pro Preview 05-06 when vision-heavy evaluation matters.
Decision scorecard
Local evidence first| Signal | Gemini 2.5 Pro Preview 05-06 | Gemini 3.1 Pro Preview |
|---|---|---|
| Best for | multimodal apps and long-context analysis | multimodal apps, tool-calling agents, and long-context analysis |
| Decision fit | RAG, Long context, and Vision | Coding, RAG, and Agents |
| Context window | 1m | 1m |
| Cheapest output | $10/1M tokens | $12/1M tokens |
| Provider routes | 1 tracked | 5 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Gemini 2.5 Pro Preview 05-06 has the lower cheapest tracked output price at $10/1M tokens.
- Local decision data tags Gemini 2.5 Pro Preview 05-06 for RAG, Long context, and Vision.
- Gemini 3.1 Pro Preview has broader tracked provider coverage for fallback and route flexibility.
- Gemini 3.1 Pro Preview uniquely exposes JSON / Tool use and Code execution in local model data.
- Local decision data tags Gemini 3.1 Pro Preview for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Gemini 2.5 Pro Preview 05-06
$3,500
Cheapest tracked route/tier: OpenRouter
Gemini 3.1 Pro Preview
$4,600
Cheapest tracked route/tier: Google AI Studio
Estimated monthly gap: $1,100. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Gemini 3.1 Pro Preview is $2/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Gemini 3.1 Pro Preview adds JSON / Tool use and Code execution in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Gemini 2.5 Pro Preview 05-06 is $2/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for JSON / Tool use and Code execution before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-05-06 | 2026-02-19 |
| Context window | 1m | 1m |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2025-01 | 2025-01 |
Pricing and availability
| Pricing attribute | Gemini 2.5 Pro Preview 05-06 | Gemini 3.1 Pro Preview |
|---|---|---|
| Input price | $1.25/1M tokens |
|
| Output price | $10/1M tokens |
|
| Providers |
Capabilities
| Capability | Gemini 2.5 Pro Preview 05-06 | Gemini 3.1 Pro Preview |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | No |
| JSON / Tool use | No | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.