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Claude Opus 5 vs OpenAI: GPT-5.3-Codex

Claude Opus 5 (high) leads on average score with 9.2 vs 8.9. GPT-5.3-Codex (medium) has the lower benchmark cost at $0.920 vs $2.835. GPT-5.3-Codex (medium) is faster at 16.96s vs 20.44s, with pass rates of 84.9% vs 83.3%.

Recommended modelGPT-5.3-Codex (medium)Its score stays close to the best score here (8.9 vs 9.2), while costing about 3.1x less than Claude Opus 5 (high).

Last updated at: 2026-07-25

Metric Claude Opus 5 Claude Opus 5 high Release: 2026-07-25 GPT-5.3-Codex GPT-5.3-Codex medium Release: 2026-02-05
Score 9.2 8.9
Rank #11 #18
Reliability 10.0 10.0
Consistency 9.6 8.6
Tests Correct
Attempt pass rate 84.9% 83.3%
Flaky tests 1 4
Total Runs 66 66
Cost per result 15.747 5.748
Total Cost $2.835 $0.920
Input Price $5.000 / 1M $1.750 / 1M
Output Price $25.000 / 1M $14.000 / 1M
Total Input Tokens 135,959 81,268
Output Tokens 67,066 6,251
Reasoning Tokens 19,114 49,274
Response Time (avg) 20.44s 16.96s
Response Time (max) 159.01s 100.93s
Response Time (total) 449.68s 373.19s

Hamster playing table tennis

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

#11 Claude Opus 5

high
Cost
$0.265
Time
144.5s
Tokens
10,741 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 10.0 10.0 100.0% 0 12.73s 10,590 7,547 1,721
GPT-5.3-Codex 10.0 10.0 100.0% 0 19.50s 7,302 535 10,890

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