Gemini 3.1 Flash Lite Preview vs GPT-5.2
Gemini 3.1 Flash Lite Preview (2026) and GPT-5.2 (2025) are frontier reasoning models from Google DeepMind and OpenAI. Gemini 3.1 Flash Lite Preview ships a 1M-token context window, while GPT-5.2 ships a 400K-token context window. On pricing, Gemini 3.1 Flash Lite Preview costs $0.25/1M input tokens versus $1.75/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Gemini 3.1 Flash Lite Preview is ~600% cheaper at $0.25/1M; pay for GPT-5.2 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Gemini 3.1 Flash Lite Preview | GPT-5.2 |
|---|---|---|
| Best for | multimodal apps, tool-calling agents, and long-context analysis | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1M | 400K |
| Cheapest output | $1.50/1M tokens | $14/1M tokens |
| Provider routes | 4 tracked | 3 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Gemini 3.1 Flash Lite Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 3.1 Flash Lite Preview has the lower cheapest tracked output price at $1.50/1M tokens.
- Gemini 3.1 Flash Lite Preview has broader tracked provider coverage for fallback and procurement flexibility.
- Local decision data tags Gemini 3.1 Flash Lite Preview for Coding, RAG, and Agents.
- GPT-5.2 uniquely exposes Reasoning in local model data.
- Local decision data tags GPT-5.2 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 3.1 Flash Lite Preview
$575
Cheapest tracked route/tier: Google AI Studio
GPT-5.2
$4,900
Cheapest tracked route/tier: Replicate API
Estimated monthly gap: $4,325. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- GPT-5.2 is $12.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- GPT-5.2 adds Reasoning in local capability data.
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- Gemini 3.1 Flash Lite Preview is $12.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-03-03 | 2025-12-11 |
| Context window | 1M | 400K |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-01 | 2025-08 |
Pricing and availability
| Pricing attribute | Gemini 3.1 Flash Lite Preview | GPT-5.2 |
|---|---|---|
| Input price | $0.25/1M tokens | $1.75/1M tokens |
| Output price | $1.50/1M tokens | $14/1M tokens |
| Providers |
Capabilities
| Capability | Gemini 3.1 Flash Lite Preview | GPT-5.2 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on reasoning mode: GPT-5.2. 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 3.1 Flash Lite Preview lists $0.25/1M input and $1.50/1M output tokens on the cheapest tracked provider, while GPT-5.2 lists $1.75/1M input and $14/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Gemini 3.1 Flash Lite Preview lower by about $4.80 per million blended tokens. Availability is 4 providers versus 3, so concentration risk also matters.
Choose Gemini 3.1 Flash Lite Preview when coding workflow support, larger context windows, and lower input-token cost are central to the workload. Choose GPT-5.2 when coding workflow support 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 3.1 Flash Lite Preview or GPT-5.2?
Gemini 3.1 Flash Lite Preview supports 1M tokens, while GPT-5.2 supports 400K 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 3.1 Flash Lite Preview or GPT-5.2?
Gemini 3.1 Flash Lite Preview is cheaper on tracked token pricing. Gemini 3.1 Flash Lite Preview costs $0.25/1M input and $1.50/1M output tokens. GPT-5.2 costs $1.75/1M input and $14/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemini 3.1 Flash Lite Preview or GPT-5.2 open source?
Gemini 3.1 Flash Lite Preview is listed under Proprietary. GPT-5.2 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 3.1 Flash Lite Preview or GPT-5.2?
Both Gemini 3.1 Flash Lite Preview and GPT-5.2 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 3.1 Flash Lite Preview or GPT-5.2?
Both Gemini 3.1 Flash Lite Preview and GPT-5.2 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 3.1 Flash Lite Preview and GPT-5.2?
Gemini 3.1 Flash Lite Preview is available on Google AI Studio, GCP Vertex AI, OpenRouter, and Vercel AI Gateway. GPT-5.2 is available on Replicate API, OpenRouter, and Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-22. Data sourced from public model cards and provider documentation.