Gemini 2.5 Flash Live API vs Gemini 3.1 Flash-Lite
Gemini 2.5 Flash Live API (2025) and Gemini 3.1 Flash-Lite (2026) are compact production models from Google DeepMind. Gemini 2.5 Flash Live API ships a 128K-token context window, while Gemini 3.1 Flash-Lite ships a 1M-token context window. On pricing, Gemini 3.1 Flash-Lite costs $0.25/1M input tokens versus $0.5/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Gemini 3.1 Flash-Lite is ~100% cheaper at $0.25/1M; pay for Gemini 2.5 Flash Live API only for vision-heavy evaluation.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-12-01 | 2026-05-07 |
| Context window | 128K | 1M |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | - | 2025-01 |
Pricing and availability
| Pricing attribute | Gemini 2.5 Flash Live API | Gemini 3.1 Flash-Lite |
|---|---|---|
| Input price | $0.5/1M tokens | $0.25/1M tokens |
| Output price | $2/1M tokens | $1.5/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 2.5 Flash Live API | Gemini 3.1 Flash-Lite |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | No | Yes |
| Code execution | No | Yes |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on structured outputs: Gemini 3.1 Flash-Lite and code execution: Gemini 3.1 Flash-Lite. Both models share vision, multimodal input, function calling, and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Gemini 2.5 Flash Live API lists $0.5/1M input and $2/1M output tokens, while Gemini 3.1 Flash-Lite lists $0.25/1M input and $1.5/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Gemini 3.1 Flash-Lite lower by about $0.32 per million blended tokens. Availability is 1 providers versus 2, so concentration risk also matters.
Choose Gemini 2.5 Flash Live API when vision-heavy evaluation are central to the workload. Choose Gemini 3.1 Flash-Lite when coding workflow support, larger context windows, and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which has a larger context window, Gemini 2.5 Flash Live API or Gemini 3.1 Flash-Lite?
Gemini 3.1 Flash-Lite supports 1M tokens, while Gemini 2.5 Flash Live API supports 128K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Gemini 2.5 Flash Live API or Gemini 3.1 Flash-Lite?
Gemini 3.1 Flash-Lite is cheaper on tracked token pricing. Gemini 2.5 Flash Live API costs $0.5/1M input and $2/1M output tokens. Gemini 3.1 Flash-Lite costs $0.25/1M input and $1.5/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemini 2.5 Flash Live API or Gemini 3.1 Flash-Lite open source?
Gemini 2.5 Flash Live API is listed under Proprietary. Gemini 3.1 Flash-Lite is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Gemini 2.5 Flash Live API or Gemini 3.1 Flash-Lite?
Both Gemini 2.5 Flash Live API and Gemini 3.1 Flash-Lite expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Gemini 2.5 Flash Live API or Gemini 3.1 Flash-Lite?
Both Gemini 2.5 Flash Live API and Gemini 3.1 Flash-Lite expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Gemini 2.5 Flash Live API and Gemini 3.1 Flash-Lite?
Gemini 2.5 Flash Live API is available on Google AI Studio. Gemini 3.1 Flash-Lite is available on Google AI Studio and OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-11. Data sourced from public model cards and provider documentation.