Gemini Deep Research Preview vs GPT-5.5
Gemini Deep Research Preview (2026) and GPT-5.5 (2026) are frontier reasoning models from Google DeepMind and OpenAI. Gemini Deep Research Preview ships a 1M-token context window, while GPT-5.5 ships a 1.1M-token context window. On pricing, Gemini Deep Research Preview costs $2/1M input tokens versus $5/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Gemini Deep Research Preview is ~150% cheaper at $2/1M; pay for GPT-5.5 only for coding workflow support.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-21 | 2026-04-23 |
| Context window | 1M | 1.1M |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | - | 2025-12 |
Pricing and availability
| Pricing attribute | Gemini Deep Research Preview | GPT-5.5 |
|---|---|---|
| Input price | $2/1M tokens | $5/1M tokens |
| Output price | $12/1M tokens | $30/1M tokens |
| Providers |
Capabilities
| Capability | Gemini Deep Research Preview | GPT-5.5 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on reasoning mode: GPT-5.5 and code execution: GPT-5.5. 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 Deep Research Preview lists $2/1M input and $12/1M output tokens, while GPT-5.5 lists $5/1M input and $30/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Gemini Deep Research Preview lower by about $7.5 per million blended tokens. Availability is 1 providers versus 2, so concentration risk also matters.
Choose Gemini Deep Research Preview when vision-heavy evaluation and lower input-token cost are central to the workload. Choose GPT-5.5 when coding workflow support, larger context windows, and broader provider choice 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 Deep Research Preview or GPT-5.5?
GPT-5.5 supports 1.1M tokens, while Gemini Deep Research Preview supports 1M 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 Deep Research Preview or GPT-5.5?
Gemini Deep Research Preview is cheaper on tracked token pricing. Gemini Deep Research Preview costs $2/1M input and $12/1M output tokens. GPT-5.5 costs $5/1M input and $30/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Gemini Deep Research Preview or GPT-5.5 open source?
Gemini Deep Research Preview is listed under Proprietary. GPT-5.5 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 Deep Research Preview or GPT-5.5?
Both Gemini Deep Research Preview and GPT-5.5 expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, Gemini Deep Research Preview or GPT-5.5?
Both Gemini Deep Research Preview and GPT-5.5 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 Deep Research Preview and GPT-5.5?
Gemini Deep Research Preview is available on Google AI Studio. GPT-5.5 is available on OpenAI API 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.