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Claude Opus 4.8 vs o3-mini (High)

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

o3-mini with reasoning effort set to high for maximum STEM accuracy.

74200K ctx$1.10/$4.40 per M#45/92
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
Reasoning
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Smarter21%
Capability
CapabilityECI21%89.2
Reasoning & Knowledge
Graduate Science18%91.0%Factual Recall39.5%
Math
Math Problems—Competition Math28%98.3%Research Math281%47.2%
Coding
Real-World Coding88.6%Code Editing—
Agentic
Novel Reasoning2311%72.1%
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper81%
Capability
CapabilityECI73.9
Reasoning & Knowledge
Graduate Science77.0%Factual Recall—
Math
Math Problems96.5%Competition Math76.9%Research Math12.4%
Coding
Real-World Coding—Code Editing60.4%
Agentic
Novel Reasoning3.0%
Specs
1M
Context
128K
Max output
May 2026
Released
200K
Context
100K
Max output
Feb 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 read9%$0.50/M tokens
Cache write$6.25/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input78%$1.10/M tokens
Output82%$4.40/M tokens
Cache read$0.55/M tokens
Web search$0.01/search
Chat with Claude Opus 4.8Go to model
Chat with o3-mini (High)Go to model
Frequently Asked Questions: Claude Opus 4.8 vs o3-mini (High)▼

Which is better, Claude Opus 4.8 or o3-mini (High)?

▼

Based on the Capability Index, Claude Opus 4.8 scores higher (89.2 vs 73.9). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, Claude Opus 4.8 or o3-mini (High)?

▼

o3-mini (High) has a lower blended cost. Claude Opus 4.8: $5.00 input / $25.00 output. o3-mini (High): $1.10 input / $4.40 output.

Which has a larger context window, Claude Opus 4.8 or o3-mini (High)?

▼

Claude Opus 4.8 has a larger context window: Claude Opus 4.8 supports 1M tokens vs o3-mini (High) at 200K tokens.

Do both Claude Opus 4.8 and o3-mini (High) support vision?

▼

Claude Opus 4.8 supports vision/image input, but o3-mini (High) does not.

What are the key differences between Claude Opus 4.8 and o3-mini (High)?

▼

Key differences: Claude Opus 4.8 has a notably higher capability index (15.3 point gap); o3-mini (High) is significantly cheaper; only Claude Opus 4.8 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 Claude Opus 4.8 and o3-mini (High) for free on idapt.app to see which performs better for your specific needs.

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