Gemini Robotics-ER 1.5 Preview vs GPT-5.5 Instant
Gemini Robotics-ER 1.5 Preview (2025) and GPT-5.5 Instant (2026) are compact production models from Google DeepMind and OpenAI. Gemini Robotics-ER 1.5 Preview ships a 32k-token context window, while GPT-5.5 Instant ships a 400k-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. It focuses on practical selection signals rather than broad model-family marketing.
GPT-5.5 Instant fits 13x more tokens; pick it for long-context work and Gemini Robotics-ER 1.5 Preview for tighter calls.
Decision scorecard
Local evidence first| Signal | Gemini Robotics-ER 1.5 Preview | GPT-5.5 Instant |
|---|---|---|
| Best for | multimodal apps and tool-calling agents | multimodal apps and tool-calling agents |
| Decision fit | Agents, Vision, and JSON / Tool use | Coding, RAG, and Agents |
| Context window | 32k | 400k |
| Cheapest output | - | $30/1M tokens |
| Provider routes | 1 tracked | 1 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Local decision data tags Gemini Robotics-ER 1.5 Preview for Agents, Vision, and JSON / Tool use.
- GPT-5.5 Instant has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.5 Instant uniquely exposes Structured outputs and Code execution in local model data.
- Local decision data tags GPT-5.5 Instant 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 Robotics-ER 1.5 Preview
Unavailable
No complete token price in local provider data
GPT-5.5 Instant
$11,500
Cheapest tracked route/tier: OpenAI API
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for Gemini Robotics-ER 1.5 Preview and GPT-5.5 Instant; plan for SDK, billing, or endpoint changes.
- GPT-5.5 Instant adds Structured outputs and Code execution in local capability data.
- No overlapping tracked provider route is sourced for GPT-5.5 Instant and Gemini Robotics-ER 1.5 Preview; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Structured outputs and Code execution before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-03-12 | 2026-05-05 |
| Context window | 32k | 400k |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | - | 2025-08 |
Pricing and availability
| Pricing attribute | Gemini Robotics-ER 1.5 Preview | GPT-5.5 Instant |
|---|---|---|
| Input price | - | $5/1M tokens |
| Output price | - | $30/1M tokens |
| Providers |
Capabilities
| Capability | Gemini Robotics-ER 1.5 Preview | GPT-5.5 Instant |
|---|---|---|
| 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 |
| 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 structured outputs: GPT-5.5 Instant and code execution: GPT-5.5 Instant. 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.
Pricing coverage is uneven: Gemini Robotics-ER 1.5 Preview has no token price sourced yet and GPT-5.5 Instant has $5/1M input tokens. Provider availability is 1 tracked routes versus 1. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Gemini Robotics-ER 1.5 Preview when vision-heavy evaluation are central to the workload. Choose GPT-5.5 Instant when coding workflow support and larger context windows 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. For teams standardizing a stack, that distinction is often the difference between a benchmark win and a reliable deployment.
FAQ
Which has a larger context window, Gemini Robotics-ER 1.5 Preview or GPT-5.5 Instant?
GPT-5.5 Instant supports 400k tokens, while Gemini Robotics-ER 1.5 Preview supports 32k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is Gemini Robotics-ER 1.5 Preview or GPT-5.5 Instant open source?
Gemini Robotics-ER 1.5 Preview is listed under Proprietary. GPT-5.5 Instant 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 Robotics-ER 1.5 Preview or GPT-5.5 Instant?
Both Gemini Robotics-ER 1.5 Preview and GPT-5.5 Instant 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 Robotics-ER 1.5 Preview or GPT-5.5 Instant?
Both Gemini Robotics-ER 1.5 Preview and GPT-5.5 Instant expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for function calling, Gemini Robotics-ER 1.5 Preview or GPT-5.5 Instant?
Both Gemini Robotics-ER 1.5 Preview and GPT-5.5 Instant expose function calling. 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 Robotics-ER 1.5 Preview and GPT-5.5 Instant?
Gemini Robotics-ER 1.5 Preview is available on Google AI Studio. GPT-5.5 Instant is available on OpenAI API. Provider coverage can affect latency, region availability, compliance posture, and fallback options. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
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Last reviewed: 2026-05-19. Data sourced from public model cards and provider documentation.