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Gemini 3.8 Flash vs GPT 3.5 Turbo Instruct

At a glance

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

Instruction-following variant of GPT-3.5 for completion-style tasks.

4K ctx$1.50/$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
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper8%
Agentic
Task Horizon—
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-07-10
Agentic
Task Horizon1min
Specs
1.0M
Context
66K
Max output
Sep 2026
Released
4K
Context
4K
Max output
Sep 2023
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input50%$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
Live pricing, shown before you run
Input$1.50/M tokens
Output47%$2.00/M tokens
Chat with Gemini 3.8 FlashGo to model
Chat with GPT 3.5 Turbo InstructGo to model
Frequently Asked Questions: Gemini 3.8 Flash vs GPT 3.5 Turbo Instruct▼

Which is better, Gemini 3.8 Flash or GPT 3.5 Turbo Instruct?

▼

Both Gemini 3.8 Flash and GPT 3.5 Turbo Instruct 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 3.8 Flash or GPT 3.5 Turbo Instruct?

▼

Gemini 3.8 Flash has a lower blended cost. Gemini 3.8 Flash: $0.75 input / $3.75 output. GPT 3.5 Turbo Instruct: $1.50 input / $2.00 output.

Which has a larger context window, Gemini 3.8 Flash or GPT 3.5 Turbo Instruct?

▼

Gemini 3.8 Flash has a larger context window: Gemini 3.8 Flash supports 1M tokens vs GPT 3.5 Turbo Instruct at 4K tokens.

Do both Gemini 3.8 Flash and GPT 3.5 Turbo Instruct support vision?

▼

Gemini 3.8 Flash supports vision/image input, but GPT 3.5 Turbo Instruct does not.

What are the key differences between Gemini 3.8 Flash and GPT 3.5 Turbo Instruct?

▼

Key differences: only Gemini 3.8 Flash supports vision input; only Gemini 3.8 Flash offers extended reasoning mode. 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 3.8 Flash and GPT 3.5 Turbo Instruct for free on idapt.app to see which performs better for your specific needs.

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