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Claude Opus 5.5 vs Gemini 3.1 Flash Lite

At a glance

Anthropic's new flagship for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.

1M ctx$4.00/$20.00 per M

Google's high-efficiency model for high-volume use cases at half the cost of Gemini 3 Flash.

771.0M ctx$0.25/$1.50 per M#37/92
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Capability
Capability—
Reasoning & Knowledge
Graduate Science11%90.6%Expert-Level—Factual Recall72.2%
Math
Competition Math25%100.0%
Agentic
Novel Reasoning92.5%
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-10-02
Cheaper93%
Capability
CapabilityECI76.7
Reasoning & Knowledge
Graduate Science81.8%Expert-Level8.6%Factual Recall—
Math
Competition Math80.0%
Agentic
Novel Reasoning—
Specs
1M
Context
128K
Max output
Sep 2026
Released
1.0M
Context
66K
Max output
Mar 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$4.00/M tokens
Output$20.00/M tokens
Cache read$0.20/M tokens
Cache write$5.00/M tokens
Web search29%$0.01/search
Live pricing, shown before you run
Input94%$0.25/M tokens
Output93%$1.50/M tokens
Reasoning$1.50/M tokens
Cache read88%$0.02/M tokens
Cache write98%$0.08/M tokens
Image input$0.25/M tokens
Audio input$0.50/M tokens
Web search$0.01/search
Chat with Claude Opus 5.5Go to model
Chat with Gemini 3.1 Flash LiteGo to model
Frequently Asked Questions: Claude Opus 5.5 vs Gemini 3.1 Flash Lite▼

Which is better, Claude Opus 5.5 or Gemini 3.1 Flash Lite?

▼

Both Claude Opus 5.5 and Gemini 3.1 Flash Lite are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Claude Opus 5.5 or Gemini 3.1 Flash Lite?

▼

Gemini 3.1 Flash Lite has a lower blended cost. Claude Opus 5.5: $4.00 input / $20.00 output. Gemini 3.1 Flash Lite: $0.25 input / $1.50 output.

Which has a larger context window, Claude Opus 5.5 or Gemini 3.1 Flash Lite?

▼

Gemini 3.1 Flash Lite has a larger context window: Claude Opus 5.5 supports 1M tokens vs Gemini 3.1 Flash Lite at 1M tokens.

Do both Claude Opus 5.5 and Gemini 3.1 Flash Lite support vision?

▼

Yes, both Claude Opus 5.5 and Gemini 3.1 Flash Lite support vision/image input.

What are the key differences between Claude Opus 5.5 and Gemini 3.1 Flash Lite?

▼

Key differences: Gemini 3.1 Flash Lite 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 5.5 and Gemini 3.1 Flash Lite for free on idapt.app to see which performs better for your specific needs.

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