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Claude Opus 4.5 vs Gemini 3.1 Pro Preview Custom Tools

How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Claude Opus 4.5 and Gemini 3.1 Pro Preview Custom Tools.

Anthropic

Claude Opus 4.5

Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use. It offers strong multimodal capabilities, competitive performance across real-world coding and...

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Google

Gemini 3.1 Pro Preview Custom Tools

Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...

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Technical Specifications

SpecificationClaude Opus 4.5Gemini 3.1 Pro Preview Custom Tools
ProviderAnthropicGoogle
Context Window200,000 tokens1,048,756 tokens
Agent Suitability93/100N/A
Time to First Token (TTFT)550 msN/A
Deployment Modelmanaged apimanaged api
Production Stabilitystablebeta
API AvailableYesYes
Released Date2025-11-242026-02-25

API Pricing Comparison

Input Price per Million Tokens

Claude Opus 4.5

$5.00

Gemini 3.1 Pro Preview Custom Tools

$2.00

Output Price per Million Tokens

Claude Opus 4.5

$25.00

Gemini 3.1 Pro Preview Custom Tools

$12.00

Want to test both models live?

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Benchmark Performance Metrics

Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.

MMLUGeneral knowledge & multi-task understanding
9280.0%vsN/A
Claude Opus 4.5
Gemini 3.1 Pro Preview Custom Tools
HumanEvalPython coding & logic synthesis
9420.0%vsN/A
Claude Opus 4.5
Gemini 3.1 Pro Preview Custom Tools
MATHComplex mathematical problem solving
8750.0%vsN/A
Claude Opus 4.5
Gemini 3.1 Pro Preview Custom Tools
GPQAGraduate-level expert reasoning
7600.0%vsN/A
Claude Opus 4.5
Gemini 3.1 Pro Preview Custom Tools
HellaSwagCommonsense reasoning and inference
9720.0%vsN/A
Claude Opus 4.5
Gemini 3.1 Pro Preview Custom Tools
MT-BenchMulti-turn conversation flow quality
955.0%vsN/A
Claude Opus 4.5
Gemini 3.1 Pro Preview Custom Tools

Claude Opus 4.5 Quirks & Gotchas

  • ▸Deep analytical reasoning — best for structured problem-solving
  • ▸200K context is limiting compared to 1M of Opus 4.6+ — upgrade for long-document tasks

Gemini 3.1 Pro Preview Custom Tools Quirks & Gotchas

No developer gotchas reported.