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OpenAI: GPT-5.6 Luna vs xAI: Grok 4.3

Summary

GPT-5.6 Luna (high) vs Grok 4.3 (medium) benchmark comparison: The average score is effectively tied at 7.7 vs 7.7. Grok 4.3 (medium) has the lower benchmark cost at $0.614 vs $0.924. GPT-5.6 Luna (high) is faster at 18.39s vs 47.51s, with pass rates of 71.4% vs 71.4%.

Recommended model: GPT-5.6 Luna (high) - It has the best score here (7.7), while responding about 2.6x faster than Grok 4.3 (medium).

Last updated at: 2026-07-09

Metric GPT-5.6 Luna GPT-5.6 Luna high Release: 2026-07-09 Grok 4.3 Grok 4.3 medium Release: 2026-05-01
Score 7.7 7.7
Rank #50 #46
Reliability 10.0 10.0
Consistency 8.8 8.5
Tests Correct
Attempt pass rate 71.4% 71.4%
Flaky tests 3 4
Total Runs 63 63
Cost per result 6.594 4.724
Total Cost $0.924 $0.614
Input Price $1.000 / 1M $1.250 / 1M
Output Price $6.000 / 1M $2.500 / 1M
Total Input Tokens 35,699 44,472
Output Tokens 2,079 1,981
Reasoning Tokens 145,816 221,382
Response Time (avg) 18.39s 47.51s
Response Time (max) 111.09s 216.69s
Response Time (total) 386.24s 997.68s

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

#46 xAI: Grok 4.3

medium
Cost
$0.009
Time
19.0s
Tokens
3,661 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 4.3 10.0 10.0 100.0% 0 8.83s 2,010 88 8,207
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 4.3 5.9 7.7 44.4% 1 41.23s 8,340 1,028 31,226
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 4.3 10.0 10.0 100.0% 0 63.99s 12,909 234 15,301
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 4.3 10.0 10.0 100.0% 0 18.97s 7,761 180 9,546
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 4.3 5.3 7.2 44.4% 1 181.74s 1,764 14 111,300
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 4.3 5.4 2.5 66.7% 1 24.70s 825 70 5,020
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 4.3 9.8 10.0 100.0% 0 18.58s 1,362 57 8,713
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 4.3 5.9 7.2 55.6% 1 22.52s 1,689 128 14,468
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 4.3 10.0 10.0 100.0% 0 17.66s 7,263 168 4,615
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 4.3 3.0 10.0 0.0% 0 44.47s 549 14 12,986

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