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Gemini 3.5 Flash vs GPT 5.1 Codex Mini

At a glance

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

861.0M ctx$1.50/$9.00 per M#11/92

Compact coding model for fast, cost-efficient development tasks.

400K ctx$0.25/$2.00 per M
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
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Capability
CapabilityECI86.2
Reasoning & Knowledge
Graduate Science92.8%Factual Recall68.4%
Math
Competition Math95.6%Research Math39.0%
Coding
Real-World Coding79.3%
Agentic
Terminal Tasks—Novel Reasoning72.1%
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-07-10
Cheaper80%
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding—
Agentic
Terminal Tasks61.6%Novel Reasoning—
Specs
1.0M
Context
66K
Max output
May 2026
Released
400K
Context
100K
Max output
Nov 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$1.50/M tokens
Output$9.00/M tokens
Reasoning$9.00/M tokens
Cache read$0.15/M tokens
Cache write$0.08/M tokens
Image input$1.50/M tokens
Audio input$3.00/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input83%$0.25/M tokens
Output78%$2.00/M tokens
Cache read83%$0.02/M tokens
Web search29%$0.01/search
Chat with Gemini 3.5 FlashGo to model
Chat with GPT 5.1 Codex MiniGo to model
Frequently Asked Questions: Gemini 3.5 Flash vs GPT 5.1 Codex Mini▼

Which is better, Gemini 3.5 Flash or GPT 5.1 Codex Mini?

▼

Both Gemini 3.5 Flash and GPT 5.1 Codex Mini 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, Gemini 3.5 Flash or GPT 5.1 Codex Mini?

▼

GPT 5.1 Codex Mini has a lower blended cost. Gemini 3.5 Flash: $1.50 input / $9.00 output. GPT 5.1 Codex Mini: $0.25 input / $2.00 output.

Which has a larger context window, Gemini 3.5 Flash or GPT 5.1 Codex Mini?

▼

Gemini 3.5 Flash has a larger context window: Gemini 3.5 Flash supports 1M tokens vs GPT 5.1 Codex Mini at 400K tokens.

Do both Gemini 3.5 Flash and GPT 5.1 Codex Mini support vision?

▼

Yes, both Gemini 3.5 Flash and GPT 5.1 Codex Mini support vision/image input.

What are the key differences between Gemini 3.5 Flash and GPT 5.1 Codex Mini?

▼

Key differences: GPT 5.1 Codex Mini 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 Gemini 3.5 Flash and GPT 5.1 Codex Mini for free on idapt.app to see which performs better for your specific needs.

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