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Claude Opus 4.8 vs GPT 5.3 Codex

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

OpenAI's most advanced agentic coding model with 400K context.

87400K ctx$1.75/$14.00 per M#8/92
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
Smarter3%
Capability
CapabilityECI3%89.2
Reasoning & Knowledge
Graduate Science91.0%Factual Recall39.5%
Math
Competition Math98.3%Research Math47.2%
Coding
Real-World Coding18%88.6%
Agentic
Terminal Tasks—Novel Reasoning72.1%Task Horizon—
Reasoning
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper52%
Capability
CapabilityECI87.0
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding74.8%
Agentic
Terminal Tasks78.4%Novel Reasoning—Task Horizon5.8h
Specs
1M
Context
128K
Max output
May 2026
Released
400K
Context
128K
Max output
Feb 2026
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
Input65%$1.75/M tokens
Output44%$14.00/M tokens
Cache read65%$0.17/M tokens
Web search$0.01/search
Chat with Claude Opus 4.8Go to model
Chat with GPT 5.3 CodexGo to model
Frequently Asked Questions: Claude Opus 4.8 vs GPT 5.3 Codex▼

Which is better, Claude Opus 4.8 or GPT 5.3 Codex?

▼

Based on the Capability Index, Claude Opus 4.8 scores higher (89.2 vs 87.0). 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 GPT 5.3 Codex?

▼

GPT 5.3 Codex has a lower blended cost. Claude Opus 4.8: $5.00 input / $25.00 output. GPT 5.3 Codex: $1.75 input / $14.00 output.

Which has a larger context window, Claude Opus 4.8 or GPT 5.3 Codex?

▼

Claude Opus 4.8 has a larger context window: Claude Opus 4.8 supports 1M tokens vs GPT 5.3 Codex at 400K tokens.

Do both Claude Opus 4.8 and GPT 5.3 Codex support vision?

▼

Yes, both Claude Opus 4.8 and GPT 5.3 Codex support vision/image input.

Which has better coding performance, Claude Opus 4.8 or GPT 5.3 Codex?

▼

Claude Opus 4.8 scores higher on SWE-bench Verified: Claude Opus 4.8 resolves 89% vs GPT 5.3 Codex at 75%.

What are the key differences between Claude Opus 4.8 and GPT 5.3 Codex?

▼

Key differences: GPT 5.3 Codex 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 5.3 Codex for free on idapt.app to see which performs better for your specific needs.

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