Gemini Robotics-ER 1.6 Preview vs GPT-4o Search Preview

Name: Gemini Robotics-ER 1.6 Preview
Author: Google DeepMind

Gemini Robotics-ER 1.6 Preview (2026) and GPT-4o Search Preview (2025) are frontier reasoning models from Google DeepMind and OpenAI. Gemini Robotics-ER 1.6 Preview ships a 128k-token context window, while GPT-4o Search Preview ships a 128k-token context window. On pricing, Gemini Robotics-ER 1.6 Preview costs $1/1M input tokens versus $2.50/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

Gemini Robotics-ER 1.6 Preview is ~150% cheaper at $1/1M; pay for GPT-4o Search Preview only for provider fit.

Decision scorecard

Local evidence first

Signal	Gemini Robotics-ER 1.6 Preview	GPT-4o Search Preview	How to read it
Best for	reasoning-heavy apps, multimodal apps, and tool-calling agents	general production evaluation	Use-case synthesis from product type, capability flags, context, and provider data.
Decision fit	RAG, Agents, and Long context	RAG, Long context, and Classification	Primary workload tags from local decision data.
Context window	128k	128k	Higher is better when prompts, retrieval chunks, or transcripts are large.
Cheapest output	$5/1M tokens	$10/1M tokens	Cheapest tracked provider route; verify your exact region and tier.
Provider routes	1 tracked	1 tracked	Broader coverage can reduce vendor lock-in and fallback risk.
Shared benchmarks	0 shared	0 shared	No shared benchmark scores are available for this pair yet.

Decision tradeoffs

Choose Gemini Robotics-ER 1.6 Preview when...

Gemini Robotics-ER 1.6 Preview has the lower cheapest tracked output price at $5/1M tokens.
Gemini Robotics-ER 1.6 Preview uniquely exposes Vision, Multimodal, and Reasoning in local model data.
Local decision data tags Gemini Robotics-ER 1.6 Preview for RAG, Agents, and Long context.

Choose GPT-4o Search Preview when...

Local decision data tags GPT-4o Search Preview for RAG, Long context, and Classification.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Gemini Robotics-ER 1.6 Preview

Requests / monthInput tokens / requestOutput tokens / request

Gemini Robotics-ER 1.6 Preview

$2,050

Cheapest tracked route/tier: Google AI Studio

GPT-4o Search Preview

$4,500

Cheapest tracked route/tier: OpenRouter

Estimated monthly gap: $2,450. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Gemini Robotics-ER 1.6 Preview -> GPT-4o Search Preview

No overlapping tracked provider route is sourced for Gemini Robotics-ER 1.6 Preview and GPT-4o Search Preview; plan for SDK, billing, or endpoint changes.
GPT-4o Search Preview is $5/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.

GPT-4o Search Preview -> Gemini Robotics-ER 1.6 Preview

No overlapping tracked provider route is sourced for GPT-4o Search Preview and Gemini Robotics-ER 1.6 Preview; plan for SDK, billing, or endpoint changes.
Gemini Robotics-ER 1.6 Preview is $5/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Gemini Robotics-ER 1.6 Preview adds Vision, Multimodal, and Reasoning in local capability data.

Specs

Specification	Gemini Robotics-ER 1.6 Preview Google DeepMind	GPT-4o Search Preview OpenAI
Released	2026-04-14	2025-02-26
Context window	128k	128k
Parameters	—	—
Architecture	Decoder Only	Decoder Only
License	Proprietary	Proprietary
Openness	Proprietary	Proprietary
Commercial use	Commercial use: conditional	Commercial use: conditional
Knowledge cutoff	-	2023-10

Pricing and availability

Pricing attribute	Gemini Robotics-ER 1.6 Preview	GPT-4o Search Preview
Input price	$1/1M tokens	$2.50/1M tokens
Output price	$5/1M tokens	$10/1M tokens
Providers	Google AI Studio	OpenRouter

Capabilities

Capability	Gemini Robotics-ER 1.6 Preview	GPT-4o Search Preview
Vision	Yes	No
Multimodal	Yes	No
Reasoning	Yes	No
Function calling	Yes	No
Tool use	Yes	No
Structured outputs	Yes	Yes
Code execution	No	No
IDE integration	No	No
Computer use	No	No
Parallel agents	No	No

Benchmarks

No shared benchmark scores are currently available for this pair.

Deep dive

The capability footprint differs most on vision: Gemini Robotics-ER 1.6 Preview, multimodal input: Gemini Robotics-ER 1.6 Preview, reasoning mode: Gemini Robotics-ER 1.6 Preview, function calling: Gemini Robotics-ER 1.6 Preview, and tool use: Gemini Robotics-ER 1.6 Preview. Both models share structured outputs, 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 Robotics-ER 1.6 Preview lists $1/1M input and $5/1M output tokens on the cheapest tracked provider, while GPT-4o Search Preview lists $2.50/1M input and $10/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Gemini Robotics-ER 1.6 Preview lower by about $2.55 per million blended tokens. Availability is 1 providers versus 1, so concentration risk also matters.

Choose Gemini Robotics-ER 1.6 Preview when reasoning depth and lower input-token cost are central to the workload. Choose GPT-4o Search Preview when provider fit are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.

FAQ

Which has a larger context window, Gemini Robotics-ER 1.6 Preview or GPT-4o Search Preview?

Gemini Robotics-ER 1.6 Preview supports 128k tokens, while GPT-4o Search Preview 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 Robotics-ER 1.6 Preview or GPT-4o Search Preview?

Gemini Robotics-ER 1.6 Preview is cheaper on tracked token pricing. Gemini Robotics-ER 1.6 Preview costs $1/1M input and $5/1M output tokens. GPT-4o Search Preview costs $2.50/1M input and $10/1M output tokens. Provider discounts or batch pricing can still change the final bill.

Is Gemini Robotics-ER 1.6 Preview or GPT-4o Search Preview open source?

Gemini Robotics-ER 1.6 Preview is listed under Proprietary. GPT-4o Search Preview 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 1.6 Preview or GPT-4o Search Preview?

Gemini Robotics-ER 1.6 Preview has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.

Which is better for multimodal input, Gemini Robotics-ER 1.6 Preview or GPT-4o Search Preview?

Gemini Robotics-ER 1.6 Preview has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.

Where can I run Gemini Robotics-ER 1.6 Preview and GPT-4o Search Preview?

Gemini Robotics-ER 1.6 Preview is available on Google AI Studio. GPT-4o Search Preview is available on OpenRouter. 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: 2026-06-15. Data sourced from public model cards and provider documentation.

Both models

Gemini Robotics-ER 1.6 Preview GPT-4o Search Preview