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Anthropic: Claude Sonnet 4.6 vs OpenAI: GPT-5.3-Codex

Last updated at: 2026-04-14

Metric Claude Sonnet 4.6 Claude Sonnet 4.6 none Release: 2026-02-17 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 7.4 8.6
Rank #39 #5
Consistency 9.6 8.7
Tests Correct
Attempt pass rate 64.8% 83.3%
Flaky tests 1 3
Total Runs 54 54
Cost per result 2.376 4.405
Total Cost $0.262 $0.573
Input Price $3.000 / 1M $1.750 / 1M
Output Price $15.000 / 1M $14.000 / 1M
Output Tokens 7,433 2,279
Reasoning Tokens 0 35,179
Response Time (avg) 4.98s 15.38s
Response Time (max) 23.84s 100.93s
Response Time (total) 54.83s 276.91s

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Score vs Total Cost

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Score vs Response Time (avg)

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Score vs Total Output Tokens

Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 4.8 10.0 25.0% 0 2.94s 1,214 0
GPT-5.3-Codex 8.7 7.9 91.7% 1 4.16s 240 1,722
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 3.67s 523 0
GPT-5.3-Codex 10.0 10.0 100.0% 0 8.95s 491 1,530
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 9.5 10.0 100.0% 0 23.84s 3,766 0
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.56s 364 2,731
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 3.43s 252 0
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.07s 234 728
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 7.7 10.0 66.7% 0 3.54s 413 0
GPT-5.3-Codex 5.9 7.2 55.6% 1 64.31s 64 25,308
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 6.1 3.1 66.7% 1 2.56s 192 0
GPT-5.3-Codex 4.6 10.0 0.0% 0 4.87s 187 331
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 6.5 10.0 50.0% 0 1.96s 90 0
GPT-5.3-Codex 10.0 10.0 100.0% 0 3.04s 93 693
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 7.7 10.0 66.7% 0 2.92s 536 0
GPT-5.3-Codex 9.0 7.9 88.9% 1 5.12s 352 1,644
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Sonnet 4.6 10.0 10.0 100.0% 0 4.11s 447 0
GPT-5.3-Codex 10.0 10.0 100.0% 0 6.37s 254 492

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