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GPT 5.3 Codex vs Claude Sonnet 5

At a glance

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

87400K ctx$1.75/$14.00 per M#8/92

Anthropic's fifth-generation Sonnet — near-Opus intelligence at Sonnet speed and price.

801M ctx$2.00/$10.00 per M#26/92
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
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter9%
Capability
CapabilityECI9%87.0
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Coding
Real-World Coding74.8%
Agentic
Terminal Tasks78.4%Task Horizon5.8h
Reasoning
CI 72.7-84.7Provisional
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper17%
Capability
CapabilityECI80.1
Reasoning & Knowledge
Graduate Science90.5%Factual Recall25.0%
Math
Competition Math94.7%
Coding
Real-World Coding—
Agentic
Terminal Tasks—Task Horizon—
Specs
400K
Context
128K
Max output
Feb 2026
Released
1M
Context
128K
Max output
Jun 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input13%$1.75/M tokens
Output$14.00/M tokens
Cache read12%$0.17/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$2.00/M tokens
Output29%$10.00/M tokens
Cache read$0.20/M tokens
Cache write$2.50/M tokens
Web search$0.01/search
Chat with GPT 5.3 CodexGo to model
Chat with Claude Sonnet 5Go to model
Frequently Asked Questions: GPT 5.3 Codex vs Claude Sonnet 5▼

Which is better, GPT 5.3 Codex or Claude Sonnet 5?

▼

Based on the Capability Index, GPT 5.3 Codex scores higher (87.0 vs 80.1). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, GPT 5.3 Codex or Claude Sonnet 5?

▼

Claude Sonnet 5 has a lower blended cost. GPT 5.3 Codex: $1.75 input / $14.00 output. Claude Sonnet 5: $2.00 input / $10.00 output.

Which has a larger context window, GPT 5.3 Codex or Claude Sonnet 5?

▼

Claude Sonnet 5 has a larger context window: GPT 5.3 Codex supports 400K tokens vs Claude Sonnet 5 at 1M tokens.

Do both GPT 5.3 Codex and Claude Sonnet 5 support vision?

▼

Yes, both GPT 5.3 Codex and Claude Sonnet 5 support vision/image input.

What are the key differences between GPT 5.3 Codex and Claude Sonnet 5?

▼

Key differences: GPT 5.3 Codex has a notably higher capability index (6.9 point gap). 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 GPT 5.3 Codex and Claude Sonnet 5 for free on idapt.app to see which performs better for your specific needs.

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