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Claude Opus 4.8 vs GPT 5.1 Codex Mini

At a glance

Anthropic's most capable Opus yet, built for long-horizon autonomous agents and frontier coding.

891M ctx$5.00/$25.00 per M#4/92

Compact coding model for fast, cost-efficient development tasks.

400K ctx$0.25/$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
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Capability
CapabilityECI89.2
Reasoning & Knowledge
Graduate Science91.0%Factual Recall39.5%
Math
Competition Math98.3%Research Math47.2%
Coding
Real-World Coding88.6%
Agentic
Terminal Tasks—Novel Reasoning72.1%
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-07-10
Cheaper93%
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding—
Agentic
Terminal Tasks61.6%Novel Reasoning—
Specs
1M
Context
128K
Max output
May 2026
Released
400K
Context
100K
Max output
Nov 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
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
Input95%$0.25/M tokens
Output92%$2.00/M tokens
Cache read95%$0.02/M tokens
Web search$0.01/search
Chat with Claude Opus 4.8Go to model
Chat with GPT 5.1 Codex MiniGo to model
Frequently Asked Questions: Claude Opus 4.8 vs GPT 5.1 Codex Mini▼

Which is better, Claude Opus 4.8 or GPT 5.1 Codex Mini?

▼

Both Claude Opus 4.8 and GPT 5.1 Codex Mini 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, Claude Opus 4.8 or GPT 5.1 Codex Mini?

▼

GPT 5.1 Codex Mini has a lower blended cost. Claude Opus 4.8: $5.00 input / $25.00 output. GPT 5.1 Codex Mini: $0.25 input / $2.00 output.

Which has a larger context window, Claude Opus 4.8 or GPT 5.1 Codex Mini?

▼

Claude Opus 4.8 has a larger context window: Claude Opus 4.8 supports 1M tokens vs GPT 5.1 Codex Mini at 400K tokens.

Do both Claude Opus 4.8 and GPT 5.1 Codex Mini support vision?

▼

Yes, both Claude Opus 4.8 and GPT 5.1 Codex Mini support vision/image input.

What are the key differences between Claude Opus 4.8 and GPT 5.1 Codex Mini?

▼

Key differences: GPT 5.1 Codex Mini 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 Claude Opus 4.8 and GPT 5.1 Codex Mini for free on idapt.app to see which performs better for your specific needs.

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