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Anthropic: Claude Opus 4.8 vs OpenAI: GPT-5.5

Last updated at: 2026-05-28

Metric Claude Opus 4.8 Claude Opus 4.8 medium Release: 2026-05-28 GPT-5.5 GPT-5.5 low Release: 2026-04-24
Score 8.7 8.9
Rank #12 #8
Reliability 10.0 10.0
Consistency 9.6 10.0
Tests Correct
Attempt pass rate 83.3% 85.0%
Flaky tests 1 0
Total Runs 60 60
Cost per result 6.285 4.833
Total Cost $1.006 $0.822
Input Price $5.000 / 1M $5.000 / 1M
Output Price $25.000 / 1M $30.000 / 1M
Output Tokens 23,201 2,025
Reasoning Tokens 5,901 20,092
Response Time (avg) 9.34s 9.43s
Response Time (max) 38.03s 56.19s
Response Time (total) 186.84s 188.66s

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

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 3.95s 1,179 478
GPT-5.5 10.0 10.0 100.0% 0 4.41s 238 1,020
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 14.97s 6,651 1,381
GPT-5.5 10.0 10.0 100.0% 0 14.42s 402 4,034
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 9.8 10.0 100.0% 0 38.03s 5,260 1,588
GPT-5.5 10.0 10.0 100.0% 0 9.56s 303 717
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 7.1 5.6 83.3% 1 12.29s 481 312
GPT-5.5 10.0 10.0 100.0% 0 3.28s 228 157
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 5.3 10.0 33.3% 0 14.15s 7,477 900
GPT-5.5 5.3 10.0 33.3% 0 28.05s 69 11,609
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 2.46s 237 0
GPT-5.5 10.0 10.0 100.0% 0 5.17s 133 245
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 3.32s 373 320
GPT-5.5 9.9 10.0 100.0% 0 3.74s 93 415
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 3.95s 791 483
GPT-5.5 10.0 10.0 100.0% 0 4.74s 279 954
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 8.96s 301 225
GPT-5.5 10.0 10.0 100.0% 0 4.96s 250 101
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Output Tokens Reasoning Tokens
Claude Opus 4.8 3.0 10.0 0.0% 0 6.14s 451 214
GPT-5.5 3.0 10.0 0.0% 0 10.06s 30 840

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