LLM Reference

Gemini 2.5 Pro vs GPT-5.2

Gemini 2.5 Pro (2025) and GPT-5.2 (2025) are frontier-tier reasoning models from Google DeepMind and OpenAI. Gemini 2.5 Pro ships a 1m-token context window, while GPT-5.2 ships a 400k-token context window. On SWE-bench Verified, GPT-5.2 leads by 16.2 pts. On pricing, Gemini 2.5 Pro ranges from $1.25 to $2.50/1M input tokens by tier; GPT-5.2 costs $1.75/1M input tokens. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

GPT-5.2 is safer overall; choose Gemini 2.5 Pro when coding workflow support matters.

Decision scorecard

Local evidence first
SignalGemini 2.5 ProGPT-5.2
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentsreasoning-heavy apps, multimodal apps, and tool-calling agents
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window1m400k
Cheapest output$10/1M tokens$14/1M tokens
Provider routes4 tracked3 tracked
Shared benchmarks1 sharedSWE-bench Verified leader

Decision tradeoffs

Choose Gemini 2.5 Pro when...
  • Gemini 2.5 Pro has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Gemini 2.5 Pro has the lower cheapest tracked output price at $10/1M tokens.
  • Gemini 2.5 Pro has broader tracked provider coverage for fallback and route flexibility.
  • Local decision data tags Gemini 2.5 Pro for Coding, RAG, and Agents.
Choose GPT-5.2 when...
  • GPT-5.2 holds a shared-benchmark lead on SWE-bench Verified, ahead by 16.2 points.
  • 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.

Lower estimate Gemini 2.5 Pro

Gemini 2.5 Pro

$3,500

Cheapest tracked route/tier: Google AI Studio <=200K tokens

GPT-5.2

$4,900

Cheapest tracked route/tier: Replicate API

Estimated monthly gap: $1,400. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Gemini 2.5 Pro -> GPT-5.2
  • Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
  • GPT-5.2 is $4/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
GPT-5.2 -> Gemini 2.5 Pro
  • Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
  • Gemini 2.5 Pro is $4/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.

Specs

Specification
Released2025-06-172025-12-11
Context window1m400k
Parameters——
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff2025-012025-08

Pricing and availability

Pricing attributeGemini 2.5 ProGPT-5.2
Input price
<=200K tokens
$1.25/1M tokens
Standard Gemini 2.5 Pro pricing for prompts up to 200K tokens.
>200K tokens
$2.50/1M tokens
Higher Gemini 2.5 Pro tier for prompts above 200K tokens.
$1.75/1M tokens
Output price
<=200K tokens
$10/1M tokens
Standard Gemini 2.5 Pro pricing for prompts up to 200K tokens.
>200K tokens
$15/1M tokens
Higher Gemini 2.5 Pro tier for prompts above 200K tokens.
$14/1M tokens
Providers
Google AI StudioGCP Vertex AIOpenRouterVercel AI Gateway
Replicate APIOpenRouterVercel AI Gateway

Capabilities

CapabilityGemini 2.5 ProGPT-5.2
VisionYesYes
MultimodalYesYes
ReasoningYesYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesYes
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkGemini 2.5 ProGPT-5.2
SWE-bench Verified63.880.0

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