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Claude Sonnet 4.6 vs GPT-5.3-Codex

Comprehensive comparison between Anthropic's Claude Sonnet 4.6 and OpenAI's GPT-5.3-Codex. Compare pricing, performance, features, and user reviews.

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Claude Sonnet 4.6

Anthropic

Anthropic's most capable Sonnet yet. 1M context window (beta), 30-50% faster than Sonnet 4.5, approaching Opus-level intelligence at 1/3 the cost. Default model on claude.ai. Excels at coding, computer use, agent planning, and long-context reasoning.

$3/$15per M tokens
Details

GPT-5.3-Codex

OpenAI

OpenAI's coding-optimized model, surpassing Claude on SWE-bench. HN users praise its coding value and much more generous quotas than Claude. Ideal for intensive coding work.

$1.75/$14per M tokens
Details

Specs Comparison

SpecificationClaude Sonnet 4.6GPT-5.3-Codex
Context Window1000K256K
Max Output128K64K
Input (per 1M tokens)$3.00$1.75
Output (per 1M tokens)$15.00$14.00
Reasoning
Open Source

Scenario Score Comparison

Coding
—
vs
93
Translation
—
vs
65
Data Analysis
—
vs
78
Conversation
—
vs
60
Image Gen
—
vs
50

Claude Sonnet 4.6

Pros

  • + 1M context window (beta)
  • + Near-Opus intelligence at Sonnet price
  • + 30-50% faster than Sonnet 4.5
  • + Human-level computer use capability
  • + Excellent for agentic workflows

Cons

  • − 1M context still in beta
  • − Some users report inconsistent reasoning
  • − Still not Opus for most complex tasks

GPT-5.3-Codex

Pros

  • + Coding-optimized
  • + Great value
  • + Generous quotas
  • + SWE-bench leader

Cons

  • − Text-only
  • − Weak at creative tasks
  • − Requires Codex-specific API

Recommendation

Choose Claude Sonnet 4.6 if you:

  • • Need 1m context window (beta)
  • • Need near-opus intelligence at sonnet price
  • • Need 30-50% faster than sonnet 4.5

Choose GPT-5.3-Codex if you:

  • • Need coding-optimized
  • • Need great value
  • • Need generous quotas

Based on scores across 5 scenarios, GPT-5.3-Codex performs better overall.

Claude Sonnet 4.6 Details GPT-5.3-Codex Details

Get Started with Claude Sonnet 4.6

1Sign up at claude.ai (free)
2Sonnet is the default model
3Start chatting immediately

💡 Sonnet 4.6 is free to use on claude.ai.

Get Started with GPT-5.3-Codex

1Visit the provider's website
2Create an account
3Start using the model

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