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OpenAI: GPT-5.6 Terra vs xAI: Grok 4.5

Summary

GPT-5.6 Terra (high) vs Grok 4.5 (medium) benchmark comparison: Grok 4.5 (medium) leads on average score with 8.3 vs 8.2. GPT-5.6 Terra (high) has the lower benchmark cost at $0.852 vs $1.696. GPT-5.6 Terra (high) is faster at 10.89s vs 62.63s, with pass rates of 68.3% vs 77.8%.

Recommended model: GPT-5.6 Terra (high) - Its score stays close to the best score here (8.2 vs 8.3), while costing about 2.0x less than Grok 4.5 (medium).

Last updated at: 2026-07-09

Metric GPT-5.6 Terra GPT-5.6 Terra high Release: 2026-07-09 Grok 4.5 Grok 4.5 medium Release: 2026-07-08
Score 8.2 8.3
Rank #29 #26
Reliability 10.0 9.9
Consistency 9.6 8.9
Tests Correct
Attempt pass rate 68.3% 77.8%
Flaky tests 1 3
Total Runs 63 63
Cost per result 6.086 11.304
Total Cost $0.852 $1.696
Input Price $2.500 / 1M $2.000 / 1M
Output Price $15.000 / 1M $6.000 / 1M
Total Input Tokens 34,218 53,500
Output Tokens 1,908 1,621
Reasoning Tokens 49,189 263,127
Response Time (avg) 10.89s 62.63s
Response Time (max) 91.49s 436.38s
Response Time (total) 228.65s 1315.20s

Generation showcase

Hamster playing table tennis

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

#29 GPT-5.6 Terra

high
Cost
$0.055
Time
30.2s
Tokens
3,748 tok

#26 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
GPT-5.6 Terra 8.3 10.0 75.0% 0 2.54s 606 158 700
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
GPT-5.6 Terra 7.6 7.2 77.8% 1 9.14s 7,302 370 6,087
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
GPT-5.6 Terra 10.0 10.0 100.0% 0 6.94s 11,019 314 627
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
GPT-5.6 Terra 10.0 10.0 100.0% 0 938ms 7,140 222 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
GPT-5.6 Terra 5.3 10.0 33.3% 0 43.44s 723 70 32,942
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
GPT-5.6 Terra 5.1 10.0 0.0% 0 3.03s 477 113 216
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
GPT-5.6 Terra 10.0 10.0 100.0% 0 2.14s 660 96 319
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
GPT-5.6 Terra 7.7 10.0 66.7% 0 5.45s 642 277 2,613
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
GPT-5.6 Terra 10.0 10.0 100.0% 0 4.97s 5,454 258 168
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
GPT-5.6 Terra 3.0 10.0 0.0% 0 23.30s 195 30 5,517
Grok 4.5 3.0 10.0 0.0% 0 74.44s 789 13 14,921

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