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Anthropic: Claude Opus 4.8 vs xAI: Grok 4.5

Summary

Claude Opus 4.8 vs Grok 4.5 (medium) benchmark comparison: Grok 4.5 (medium) leads on average score with 8.3 vs 7.2. Claude Opus 4.8 has the lower benchmark cost at $0.539 vs $1.696. Claude Opus 4.8 is faster at 3.48s vs 62.63s, with pass rates of 61.9% vs 77.8%.

Recommended model: Claude Opus 4.8 - It offers the best overall trade-off: a competitive score (7.2), lower cost than Grok 4.5 (medium), and balanced response time.

Last updated at: 2026-07-08

Metric Claude Opus 4.8 Claude Opus 4.8 none Release: 2026-05-28 Grok 4.5 Grok 4.5 medium Release: 2026-07-08
Score 7.2 8.3
Rank #61 #23
Reliability 10.0 9.9
Consistency 9.2 8.9
Tests Correct
Attempt pass rate 61.9% 77.8%
Flaky tests 2 3
Total Runs 63 63
Cost per result 4.485 11.304
Total Cost $0.539 $1.696
Input Price $5.000 / 1M $2.000 / 1M
Output Price $25.000 / 1M $6.000 / 1M
Total Input Tokens 67,104 53,500
Output Tokens 8,107 1,621
Reasoning Tokens 0 263,127
Response Time (avg) 3.48s 62.63s
Response Time (max) 17.73s 436.38s
Response Time (total) 73.00s 1315.20s

Generation showcase

Hamster playing table tennis

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

#61 Claude Opus 4.8

none
Cost
$0.053
Time
22.0s
Tokens
2,253 tok

#23 xAI: Grok 4.5

medium
Cost
$0.044
Time
59.4s
Tokens
7,512 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

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 6.5 10.0 50.0% 0 3.40s 834 1,472 0
Grok 4.5 10.0 10.0 100.0% 0 23.50s 2,991 147 4,018
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 5.5 10.0 33.3% 0 3.29s 10,590 1,332 0
Grok 4.5 7.6 7.2 77.8% 1 155.69s 9,579 390 104,634
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 9.5 10.0 100.0% 0 17.73s 29,658 3,259 0
Grok 4.5 10.0 10.0 100.0% 0 15.65s 15,084 261 4,254
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 7.3 5.8 83.3% 1 1.77s 10,503 308 0
Grok 4.5 10.0 10.0 100.0% 0 6.29s 8,937 225 3,657
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 5.3 7.2 44.4% 1 1.70s 975 61 0
Grok 4.5 2.9 7.2 11.1% 1 198.89s 2,212 11 121,922
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 3.48s 708 230 0
Grok 4.5 6.5 3.4 66.7% 1 12.84s 1,077 71 2,384
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 9.9 10.0 100.0% 0 1.37s 909 95 0
Grok 4.5 9.8 10.0 100.0% 0 6.06s 1,857 57 2,728
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 7.7 10.0 66.7% 0 2.74s 894 783 0
Grok 4.5 10.0 10.0 100.0% 0 7.75s 2,430 254 3,641
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 10.0 10.0 100.0% 0 5.35s 11,775 355 0
Grok 4.5 10.0 10.0 100.0% 0 6.57s 8,544 192 968
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
Claude Opus 4.8 3.0 10.0 0.0% 0 3.41s 258 212 0
Grok 4.5 3.0 10.0 0.0% 0 74.44s 789 13 14,921

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