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Claude Opus 5 (low) vs GPT-5.3-Codex (medium)

GPT-5.3-Codex (medium) leads on average score with 9.1 vs 9.0. GPT-5.3-Codex (medium) has the lower benchmark cost at $1.318 vs $2.350. Claude Opus 5 (low) is faster at 9.87s vs 18.87s, with pass rates of 84.1% vs 84.1%.

Last updated at: 2026-10-19

Compared models

Rank
#51
Total Output Tokens
23,416
Response Time (avg)
9.87s
Total Cost
$2.350
Rank
#38
Total Output Tokens
66,287
Response Time (avg)
18.87s
Total Cost
$1.318
Recommended model GPT-5.3-Codex (medium)

It has the best score here (9.1), while costing about 1.8x less than Claude Opus 5 (low).

Detailed comparison

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 9.0 9.1
Rank #51 #38
Reliability 10.0 10.0
Consistency 9.7 8.6
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 84.1% 84.1%
Flaky tests 1 4
Total Runs 69 69
Cost per result 12.367 7.753
Total Cost $2.350 $1.318
Input Price $5.000 / 1M $1.750 / 1M
Output Price $25.000 / 1M $14.000 / 1M
Cache Read Price $0.500 / 1M $0.175 / 1M
Cache Write Price $6.250 / 1M N/A
Total Input Tokens 352,845 222,794
Output Tokens 16,553 7,357
Reasoning Tokens 7,007 58,930
Response Time (avg) 9.87s 18.87s
Response Time (max) 73.15s 100.93s
Response Time (total) 226.95s 433.94s
Parameters ~5T total (~500B active) ~1.2T total (~80B active)
Availability Closed Closed

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Model generation showcase

Hamster playing table tennis

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

#51 Claude Opus 5

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

#38 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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