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GPT 6 Astra vs Claude Opus 5 vs Gemini 3.1 Pro

The big three, in aligned columns. Each column carries the model's capability index, named benchmarks, specs, and list prices; the output band runs the same prompt across all three so you can judge tone and reasoning yourself.Last reviewed 2026-09-09.

GPT 6 Astra vs Claude Opus 5 vs Gemini 3.1 Pro

At a glance

OpenAI's new flagship for demanding end-to-end work: advanced analysis, software engineering, deep research, scientific work, and document creation.

1.1M ctx$10.00/$50.00 per M

Anthropic's flagship for demanding reasoning, coding, and long-horizon agentic work.

1M ctx$5.00/$25.00 per M

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

861.0M ctx$2.00/$12.00 per M#10/92
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
The paired significance test (McNemar, in "Measured on Idapt") appears only when exactly two models are pinned.
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
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 Horizon—
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
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 Horizon—
Reasoning
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Cheaper55%
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
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
1M
Context
128K
Max output
Jul 2026
Released
1.0M
Context
66K
Max output
Feb 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$10.00/M tokens
Output$50.00/M tokens
Cache read$1.00/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$5.00/M tokens
Output$25.00/M tokens
Cache read$0.50/M tokens
Cache write$6.25/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input60%$2.00/M tokens
Output52%$12.00/M tokens
Reasoning$12.00/M tokens
Cache read60%$0.20/M tokens
Cache write94%$0.38/M tokens
Image input$2.00/M tokens
Audio input$2.00/M tokens
Web search$0.01/search
Chat with GPT 6 AstraGo to model
Chat with Claude Opus 5Go to model
Chat with Gemini 3.1 ProGo to model

Frequently asked

Which of GPT 6 Astra, Claude Opus 5, and Gemini 3.1 Pro is the cheapest?

Gemini 3.1 Pro has the lowest blended list price. Per 1M tokens: GPT 6 Astra at $10.00 in / $50.00 out; Claude Opus 5 at $5.00 in / $25.00 out; Gemini 3.1 Pro at $2.00 in / $12.00 out.

Which of GPT 6 Astra, Claude Opus 5, and Gemini 3.1 Pro has the largest context window?

GPT 6 Astra leads with 1.1M tokens. The other two: Claude Opus 5 at 1M, Gemini 3.1 Pro at 1M.

Do GPT 6 Astra, Claude Opus 5, and Gemini 3.1 Pro support image input?

Yes, all three accept images.

Where can I run GPT 6 Astra, Claude Opus 5, and Gemini 3.1 Pro side by side?

This idapt comparison runs all three in aligned columns: the same prompt, plus benchmarks, specs, and prices per model. Open any model in chat from its column to keep working with it.

More three-way comparisons

Claude Fable 5.1 vs GPT 6 Astra vs Grok 4.6GPT 5.6 Luna vs Gemini 3.8 Flash vs Claude Haiku 4.5Claude Sonnet 5 vs Kimi K2.7 Code vs Qwen3 Coder NextDeepSeek V4 Pro (0813) vs Qwen3.8 2.4T A95B vs Nemotron 3 UltraGLM 5.3 Flash vs MiniMax M3 vs DeepSeek V4 FlashClaude Sonnet 5 vs Grok Build 0.1 vs Kimi K3Muse Spark 1.3 vs Kimi K3 vs Grok 4.6DeepSeek V4 Flash vs Gemini 3.8 Flash vs Qwen3.7 PlusGLM 5.3 vs MiniMax M3 vs DeepSeek V4 Pro (0813)