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Claude Opus 4.5 vs Gemini 3.5 Flash

At a glance

Anthropic's frontier reasoning model for complex software engineering and agentic workflows.

81200K ctx$5.00/$25.00 per M#22/92

Google's high-speed thinking model for agentic workflows, chat, and coding.

861.0M ctx$1.50/$9.00 per M#11/92
Agent Demos
All agent demos

No shared agent demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI81.4
Reasoning & Knowledge
Graduate Science80.7%Factual Recall—
Math
Competition Math48.1%Research Math20.7%
Coding
Real-World Coding76.7%
Agentic
Terminal Tasks63.1%Novel Reasoning7.8%Task Horizon4.9h
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter6%Cheaper66%
Capability
CapabilityECI6%86.2
Reasoning & Knowledge
Graduate Science15%92.8%Factual Recall68.4%
Math
Competition Math99%95.6%Research Math88%39.0%
Coding
Real-World Coding4%79.3%
Agentic
Terminal Tasks—Novel Reasoning826%72.1%Task Horizon—
Specs
200K
Context
64K
Max output
Nov 2025
Released
1.0M
Context
66K
Max output
May 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$5.00/M tokens
Output$25.00/M tokens
Cache read$0.50/M tokens
Cache write$6.25/M tokens
Web search29%$0.01/search
Live pricing, shown before you run
Input70%$1.50/M tokens
Output64%$9.00/M tokens
Reasoning$9.00/M tokens
Cache read70%$0.15/M tokens
Cache write99%$0.08/M tokens
Image input$1.50/M tokens
Audio input$3.00/M tokens
Web search$0.01/search
Chat with Claude Opus 4.5Go to model
Chat with Gemini 3.5 FlashGo to model
Frequently Asked Questions: Claude Opus 4.5 vs Gemini 3.5 Flash▼

Which is better, Claude Opus 4.5 or Gemini 3.5 Flash?

▼

Based on the Capability Index, Gemini 3.5 Flash scores higher (86.2 vs 81.4). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Claude Opus 4.5 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a lower blended cost. Claude Opus 4.5: $5.00 input / $25.00 output. Gemini 3.5 Flash: $1.50 input / $9.00 output.

Which has a larger context window, Claude Opus 4.5 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash has a larger context window: Claude Opus 4.5 supports 200K tokens vs Gemini 3.5 Flash at 1M tokens.

Do both Claude Opus 4.5 and Gemini 3.5 Flash support vision?

▼

Yes, both Claude Opus 4.5 and Gemini 3.5 Flash support vision/image input.

Which has better coding performance, Claude Opus 4.5 or Gemini 3.5 Flash?

▼

Gemini 3.5 Flash scores higher on SWE-bench Verified: Claude Opus 4.5 resolves 77% vs Gemini 3.5 Flash at 79%.

What are the key differences between Claude Opus 4.5 and Gemini 3.5 Flash?

▼

Key differences: Gemini 3.5 Flash is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Claude Opus 4.5 and Gemini 3.5 Flash for free on idapt.app to see which performs better for your specific needs.

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