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GPT 5.1 Codex vs Gemini 3.5 Flash-Lite

At a glance

Previous-generation coding-optimized model for software engineering.

400K ctx$1.25/$10.00 per M

Google's high-efficiency model for focused subagent work and multi-agent workflows.

1.0M ctx$0.30/$2.50 per M
Agent Demos
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AI Output
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Benchmarks
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Specs
400K
Context
128K
Max output
Nov 2025
Released
1.0M
Context
66K
Max output
Jul 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$1.25/M tokens
Output$10.00/M tokens
Cache read$0.13/M tokens
Web search29%$0.01/search
Live pricing, shown before you run
Input76%$0.30/M tokens
Output75%$2.50/M tokens
Reasoning$2.50/M tokens
Cache read76%$0.03/M tokens
Cache write$0.08/M tokens
Image input$0.30/M tokens
Audio input$0.30/M tokens
Web search$0.01/search
Chat with GPT 5.1 CodexGo to model
Chat with Gemini 3.5 Flash-LiteGo to model
Frequently Asked Questions: GPT 5.1 Codex vs Gemini 3.5 Flash-Lite▼

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

▼

Both GPT 5.1 Codex and Gemini 3.5 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, GPT 5.1 Codex or Gemini 3.5 Flash-Lite?

▼

Gemini 3.5 Flash-Lite has a lower blended cost. GPT 5.1 Codex: $1.25 input / $10.00 output. Gemini 3.5 Flash-Lite: $0.30 input / $2.50 output.

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

▼

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

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

▼

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

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

▼

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

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