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Gemini 3.1 Pro vs GPT 3.5 Turbo Instruct

At a glance
GoogleGemini 3.1 Pro

Google's frontier model with a large leap in core reasoning.

861.0M ctx$2.00/$12.00 per M#10/92
OpenAIGPT 3.5 Turbo Instruct

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

4K ctx$1.50/$2.00 per M
AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
GoogleGemini 3.1 Pro
Reasoning
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Capability
CapabilityECI86.4
Reasoning & Knowledge
Graduate Science94.1%Expert-Level46.4%Factual Recall77.3%
Math
Competition Math95.6%Research Math36.9%
Coding
Real-World Coding80.6%
Agentic
Terminal Tasks80.2%Novel Reasoning77.1%Task Horizon6.4h
OpenAIGPT 3.5 Turbo Instruct
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-07-10
Cheaper
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Expert-Level—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding—
Agentic
Terminal Tasks—Novel Reasoning—Task Horizon1min
Specs
GoogleGemini 3.1 Pro
1.0M
Context
66K
Max output
Feb 2026
Released
OpenAIGPT 3.5 Turbo Instruct
4K
Context
4K
Max output
Sep 2023
Released
Capabilities
GoogleGemini 3.1 Pro
Vision
Audio
Reasoning
OpenAIGPT 3.5 Turbo Instruct
Vision
Audio
Reasoning
Pricing
GoogleGemini 3.1 Pro
Live pricing, shown before you run
Input$2.00/M tokens
Output$12.00/M tokens
Reasoning$12.00/M tokens
Cache read$0.20/M tokens
Cache write$0.38/M tokens
Image input$2.00/M tokens
Audio input$2.00/M tokens
Web search$0.01/search
OpenAIGPT 3.5 Turbo Instruct
Live pricing, shown before you run
Input$1.50/M tokens
Output$2.00/M tokens
Chat with Gemini 3.1 ProGo to model
Chat with GPT 3.5 Turbo InstructGo to model
Frequently Asked Questions: Gemini 3.1 Pro vs GPT 3.5 Turbo Instruct▼

Which is better, Gemini 3.1 Pro or GPT 3.5 Turbo Instruct?

▼

Both Gemini 3.1 Pro 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 3.1 Pro or GPT 3.5 Turbo Instruct?

▼

GPT 3.5 Turbo Instruct has a lower blended cost. Gemini 3.1 Pro: $2.00 input / $12.00 output. GPT 3.5 Turbo Instruct: $1.50 input / $2.00 output.

Which has a larger context window, Gemini 3.1 Pro or GPT 3.5 Turbo Instruct?

▼

Gemini 3.1 Pro has a larger context window: Gemini 3.1 Pro supports 1M tokens vs GPT 3.5 Turbo Instruct at 4K tokens.

Do both Gemini 3.1 Pro and GPT 3.5 Turbo Instruct support vision?

▼

Gemini 3.1 Pro supports vision/image input, but GPT 3.5 Turbo Instruct does not.

What are the key differences between Gemini 3.1 Pro and GPT 3.5 Turbo Instruct?

▼

Key differences: only Gemini 3.1 Pro supports vision input; only Gemini 3.1 Pro 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 3.1 Pro and GPT 3.5 Turbo Instruct for free on idapt.app to see which performs better for your specific needs.

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