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OpenAI: GPT-5.6 Terra vs xAI: Grok 4.5

Summary

GPT-5.6 Terra (medium) vs Grok 4.5 (low) benchmark comparison: The average score is effectively tied at 7.8 vs 7.8. GPT-5.6 Terra (medium) has the lower benchmark cost at $0.496 vs $0.760. GPT-5.6 Terra (medium) is faster at 6.69s vs 15.48s, with pass rates of 68.3% vs 74.6%.

Recommended model: GPT-5.6 Terra (medium) - It has the best score here (7.8), while costing about 1.5x less than Grok 4.5 (low).

Last updated at: 2026-07-09

Metric GPT-5.6 Terra GPT-5.6 Terra medium Release: 2026-07-09 Grok 4.5 Grok 4.5 low Release: 2026-07-08
Score 7.8 7.8
Rank #37 #39
Reliability 10.0 10.0
Consistency 9.2 9.7
Tests Correct
Attempt pass rate 68.3% 74.6%
Flaky tests 2 1
Total Runs 63 63
Cost per result 3.815 5.061
Total Cost $0.496 $0.760
Input Price $2.500 / 1M $2.000 / 1M
Output Price $15.000 / 1M $6.000 / 1M
Total Input Tokens 34,218 58,652
Output Tokens 1,982 1,735
Reasoning Tokens 25,370 105,233
Response Time (avg) 6.69s 15.48s
Response Time (max) 41.68s 205.28s
Response Time (total) 140.49s 324.98s

Generation showcase

Hamster playing table tennis

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

#37 GPT-5.6 Terra

medium
Cost
$0.035
Time
16.3s
Tokens
2,418 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 Terra 8.3 10.0 75.0% 0 2.22s 606 172 657
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 Terra 6.1 7.2 55.6% 1 7.19s 7,302 427 4,527
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 Terra 10.0 10.0 100.0% 0 6.26s 11,019 316 540
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 Terra 10.0 10.0 100.0% 0 872ms 7,140 222 0
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 Terra 5.3 10.0 33.3% 0 23.45s 723 70 15,327
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 Terra 5.5 10.0 0.0% 0 2.37s 477 133 144
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 Terra 10.0 10.0 100.0% 0 1.43s 660 89 261
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 Terra 8.4 7.4 88.9% 1 3.78s 642 272 1,462
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 Terra 10.0 10.0 100.0% 0 5.09s 5,454 254 246
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 Terra 3.0 10.0 0.0% 0 10.05s 195 27 2,206
Grok 4.5 3.0 10.0 0.0% 0 13.98s 789 15 4,806

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