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Claude Opus 5 vs OpenAI: GPT-5.3-Codex

GPT-5.3-Codex (medium) leads on average score with 8.9 vs 8.6. GPT-5.3-Codex (medium) has the lower benchmark cost at $0.920 vs $1.121. Claude Opus 5 (low) is faster at 6.99s vs 16.96s, with pass rates of 80.3% vs 83.3%.

Recommended modelGPT-5.3-Codex (medium)It has the strongest score in this comparison (8.9) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-07-25

Metric Claude Opus 5 Claude Opus 5 low Release: 2026-07-25 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 8.6 8.9
Rank #23 #18
Reliability 10.0 10.0
Consistency 9.3 8.6
Tests Correct
Attempt pass rate 80.3% 83.3%
Flaky tests 2 4
Total Runs 66 66
Cost per result 6.593 5.748
Total Cost $1.121 $0.920
Input Price $5.000 / 1M $1.750 / 1M
Output Price $25.000 / 1M $14.000 / 1M
Total Input Tokens 134,773 81,268
Output Tokens 14,123 6,251
Reasoning Tokens 3,896 49,274
Response Time (avg) 6.99s 16.96s
Response Time (max) 30.67s 100.93s
Response Time (total) 153.73s 373.19s

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#23 Claude Opus 5

low
Cost
$0.062
Time
30.2s
Tokens
2,615 tok

#18 GPT-5.3-Codex

medium
Cost
$0.049
Time
54.9s
Tokens
3,580 tok

Top Models by Score

Score vs Total Cost

Response Time (avg)

Score vs Response Time (avg)

Total Output Tokens

Score vs Total Output Tokens

Category Breakdown

Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 5 7.8 7.4 77.8% 1 6.70s 10,590 2,442 760
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.50s 7,302 535 10,890

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