Gemini 2.5 Pro Preview 05-06 vs GPT-5.5

Gemini 2.5 Pro Preview 05-06 (2025) and GPT-5.5 (2026) are frontier reasoning models from Google DeepMind and OpenAI. Gemini 2.5 Pro Preview 05-06 ships a 1m-token context window, while GPT-5.5 ships a 1.05m-token context window. On pricing, Gemini 2.5 Pro Preview 05-06 costs $1.25/1M input tokens; GPT-5.5 ranges from $5 to $8/1M input tokens by tier. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

GPT-5.5 is safer overall; choose Gemini 2.5 Pro Preview 05-06 when vision-heavy evaluation matters.

Decision scorecard

Local evidence first
SignalGemini 2.5 Pro Preview 05-06GPT-5.5
Best formultimodal apps and long-context analysisreasoning-heavy apps, multimodal apps, and tool-calling agents
Decision fitRAG, Long context, and VisionCoding, RAG, and Agents
Context window1m1.05m
Cheapest output$10/1M tokens$30/1M tokens
Provider routes1 tracked4 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose Gemini 2.5 Pro Preview 05-06 when...
  • Gemini 2.5 Pro Preview 05-06 has the lower cheapest tracked output price at $10/1M tokens.
  • Local decision data tags Gemini 2.5 Pro Preview 05-06 for RAG, Long context, and Vision.
Choose GPT-5.5 when...
  • GPT-5.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • GPT-5.5 has broader tracked provider coverage for fallback and route flexibility.
  • GPT-5.5 uniquely exposes Reasoning, JSON / Tool use, and Code execution in local model data.
  • Local decision data tags GPT-5.5 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.

Lower estimate Gemini 2.5 Pro Preview 05-06

Gemini 2.5 Pro Preview 05-06

$3,500

Cheapest tracked route/tier: OpenRouter

GPT-5.5

$11,500

Cheapest tracked route/tier: OpenAI API 0-272K input tokens

Estimated monthly gap: $8,000. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Gemini 2.5 Pro Preview 05-06 -> GPT-5.5
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • GPT-5.5 is $20/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • GPT-5.5 adds Reasoning, JSON / Tool use, and Code execution in local capability data.
GPT-5.5 -> Gemini 2.5 Pro Preview 05-06
  • Provider overlap exists on OpenRouter; start route-level A/B tests there.
  • Gemini 2.5 Pro Preview 05-06 is $20/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Reasoning, JSON / Tool use, and Code execution before moving production traffic.

Specs

Specification
Released2025-05-062026-04-23
Context window1m1.05m
Parameters——
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff2025-012025-12

Pricing and availability

Pricing attributeGemini 2.5 Pro Preview 05-06GPT-5.5
Input price$1.25/1M tokens
0-272K input tokens
$5/1M tokens
Standard GPT-5.5 token pricing before the long-context surcharge threshold.
272K+ input tokens
$8/1M tokens
Long-context surcharge applies above 272K input tokens for the full session.
Output price$10/1M tokens
0-272K input tokens
$30/1M tokens
Standard GPT-5.5 token pricing before the long-context surcharge threshold.
272K+ input tokens
$36/1M tokens
Long-context surcharge applies above 272K input tokens for the full session.
Providers
OpenRouter
OpenAI APIOpenRouterVercel AI GatewayAWS Bedrock

Capabilities

CapabilityGemini 2.5 Pro Preview 05-06GPT-5.5
VisionYesYes
MultimodalYesYes
ReasoningNoYes
JSON / Tool useNoYes
Structured outputsYesYes
Code executionNoYes
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

No shared benchmark scores are currently available for this pair.

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Model pages
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.