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Mercury 2.5 vs Gemini 3.8 Flash

At a glance

Inception's latest diffusion LLM and the fastest reasoning model available, producing and refining tokens in parallel instead of one at a time.

260K ctx$0.04/$0.15 per M

Google's most intelligent Flash model, with significant gains over 3.7 Flash across software engineering, agentic tasks, and multi-step reasoning.

1.0M ctx$0.75/$3.75 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
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper96%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Specs
260K
Context
66K
Max output
Sep 2026
Released
1.0M
Context
66K
Max output
Sep 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input95%$0.04/M tokens
Output96%$0.15/M tokens
Cache read95%$0.004/M tokens
Live pricing, shown before you run
Input$0.75/M tokens
Output$3.75/M tokens
Reasoning$3.75/M tokens
Cache read$0.07/M tokens
Cache write$0.04/M tokens
Image input$0.75/M tokens
Audio input$0.75/M tokens
Web search$0.01/search
Chat with Mercury 2.5Go to model
Chat with Gemini 3.8 FlashGo to model
Frequently Asked Questions: Mercury 2.5 vs Gemini 3.8 Flash▼

Which is better, Mercury 2.5 or Gemini 3.8 Flash?

▼

Both Mercury 2.5 and Gemini 3.8 Flash 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, Mercury 2.5 or Gemini 3.8 Flash?

▼

Mercury 2.5 has a lower blended cost. Mercury 2.5: $0.04 input / $0.15 output. Gemini 3.8 Flash: $0.75 input / $3.75 output.

Which has a larger context window, Mercury 2.5 or Gemini 3.8 Flash?

▼

Gemini 3.8 Flash has a larger context window: Mercury 2.5 supports 260K tokens vs Gemini 3.8 Flash at 1M tokens.

Do both Mercury 2.5 and Gemini 3.8 Flash support vision?

▼

Gemini 3.8 Flash supports vision/image input, but Mercury 2.5 does not.

What are the key differences between Mercury 2.5 and Gemini 3.8 Flash?

▼

Key differences: Mercury 2.5 is significantly cheaper; only Gemini 3.8 Flash supports vision input. 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 Mercury 2.5 and Gemini 3.8 Flash for free on idapt.app to see which performs better for your specific needs.

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