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OpenAI: GPT-5.6 Luna vs xAI: Grok Build 0.1

Summary

GPT-5.6 Luna (high) vs Grok Build 0.1 (medium) benchmark comparison: GPT-5.6 Luna (high) leads on average score with 7.7 vs 7.6. GPT-5.6 Luna (high) has the lower benchmark cost at $0.924 vs $0.927. GPT-5.6 Luna (high) is faster at 18.39s vs 49.90s, with pass rates of 71.4% vs 61.9%.

Recommended model: GPT-5.6 Luna (high) - It has the best score here (7.7), while responding about 2.7x faster than Grok Build 0.1 (medium).

Last updated at: 2026-07-09

Metric GPT-5.6 Luna GPT-5.6 Luna high Release: 2026-07-09 Grok Build 0.1 Grok Build 0.1 medium Release: 2026-05-21
Score 7.7 7.6
Rank #50 #53
Reliability 10.0 10.0
Consistency 8.8 9.9
Tests Correct
Attempt pass rate 71.4% 61.9%
Flaky tests 3 0
Total Runs 63 63
Cost per result 6.594 7.124
Total Cost $0.924 $0.927
Input Price $1.000 / 1M $1.000 / 1M
Output Price $6.000 / 1M $2.000 / 1M
Total Input Tokens 35,699 44,418
Output Tokens 2,079 2,782
Reasoning Tokens 145,816 438,018
Response Time (avg) 18.39s 49.90s
Response Time (max) 111.09s 252.69s
Response Time (total) 386.24s 1047.92s

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

#53 xAI: Grok Build 0.1

medium
Cost
$0.028
Time
81.3s
Tokens
14,009 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 Build 0.1 8.3 10.0 75.0% 0 7.43s 2,010 220 12,162
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 Build 0.1 5.7 9.7 33.3% 0 108.46s 8,304 1,138 161,452
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 Build 0.1 10.0 10.0 100.0% 0 32.81s 12,909 231 16,917
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 Build 0.1 10.0 10.0 100.0% 0 10.72s 7,761 180 8,876
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 Build 0.1 5.3 10.0 33.3% 0 158.00s 1,764 492 175,294
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 Build 0.1 4.4 9.9 0.0% 0 18.41s 825 76 6,345
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 Build 0.1 9.8 10.0 100.0% 0 12.36s 1,362 57 9,599
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 Build 0.1 7.7 10.0 66.7% 0 18.26s 1,689 195 20,841
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 Build 0.1 10.0 10.0 100.0% 0 13.12s 7,263 180 4,969
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 Build 0.1 3.0 10.0 0.0% 0 53.51s 531 13 21,563

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