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Claude Sonnet 5 vs GPT 5.3 Codex

At a glance

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

801M ctx$2.00/$10.00 per M#26/92

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
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—
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
Specs
1M
Context
128K
Max output
Jun 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$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
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
Chat with Claude Sonnet 5Go to model
Chat with GPT 5.3 CodexGo to model
Frequently Asked Questions: Claude Sonnet 5 vs GPT 5.3 Codex▼

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

▼

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, Claude Sonnet 5 or GPT 5.3 Codex?

▼

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

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

▼

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

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

▼

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

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

▼

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 Claude Sonnet 5 and GPT 5.3 Codex for free on idapt.app to see which performs better for your specific needs.

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