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OpenAI: GPT-5.6 Luna vs xAI: Grok 4.5

Summary

GPT-5.6 Luna (high) vs Grok 4.5 (low) benchmark comparison: Grok 4.5 (low) leads on average score with 7.8 vs 7.7. Grok 4.5 (low) has the lower benchmark cost at $0.760 vs $0.924. Grok 4.5 (low) is faster at 15.48s vs 18.39s, with pass rates of 71.4% vs 74.6%.

Recommended model: Grok 4.5 (low) - It has the strongest score in this comparison (7.8) and the best overall balance of cost and response time across all 2 models.

Last updated at: 2026-07-09

Metric GPT-5.6 Luna GPT-5.6 Luna high Release: 2026-07-09 Grok 4.5 Grok 4.5 low Release: 2026-07-08
Score 7.7 7.8
Rank #50 #39
Reliability 10.0 10.0
Consistency 8.8 9.7
Tests Correct
Attempt pass rate 71.4% 74.6%
Flaky tests 3 1
Total Runs 63 63
Cost per result 6.594 5.061
Total Cost $0.924 $0.760
Input Price $1.000 / 1M $2.000 / 1M
Output Price $6.000 / 1M $6.000 / 1M
Total Input Tokens 35,699 58,652
Output Tokens 2,079 1,735
Reasoning Tokens 145,816 105,233
Response Time (avg) 18.39s 15.48s
Response Time (max) 111.09s 205.28s
Response Time (total) 386.24s 324.98s

Generation showcase

Hamster playing table tennis

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

#50 GPT-5.6 Luna

high
Cost
$0.033
Time
34.2s
Tokens
5,484 tok

#39 xAI: Grok 4.5

low
Cost
$0.011
Time
12.4s
Tokens
2,018 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
GPT-5.6 Luna 8.3 10.0 75.0% 0 2.99s 606 162 1,265
Grok 4.5 10.0 10.0 100.0% 0 2.75s 2,991 261 3,000
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 5.5 4.7 55.6% 2 15.63s 7,302 510 17,746
Grok 4.5 10.0 10.0 100.0% 0 13.72s 9,579 303 15,641
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 10.0 10.0 100.0% 0 13.29s 12,500 357 2,911
Grok 4.5 3.0 10.0 0.0% 0 8.16s 15,084 261 2,370
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 10.0 10.0 100.0% 0 2.18s 7,140 234 470
Grok 4.5 10.0 10.0 100.0% 0 3.44s 8,937 225 2,549
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 7.7 10.0 66.7% 0 78.96s 723 69 96,395
Grok 4.5 3.0 10.0 0.0% 0 72.64s 2,514 14 70,275
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 5.0 10.0 0.0% 0 3.65s 477 117 563
Grok 4.5 6.1 3.1 66.7% 1 4.88s 1,077 98 1,253
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 9.9 10.0 100.0% 0 1.79s 660 97 481
Grok 4.5 9.8 10.0 100.0% 0 2.80s 1,857 57 1,878
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 7.6 7.2 77.8% 1 14.55s 642 242 18,281
Grok 4.5 10.0 10.0 100.0% 0 3.20s 2,430 217 2,590
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 10.0 10.0 100.0% 0 4.98s 5,454 260 324
Grok 4.5 10.0 10.0 100.0% 0 5.83s 13,394 284 871
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Luna 3.0 10.0 0.0% 0 17.00s 195 31 7,380
Grok 4.5 3.0 10.0 0.0% 0 13.98s 789 15 4,806

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