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GPT-5.5 (medium) vs GPT-6.1 Terra (low)

GPT-6.1 Terra (low) leads on average score with 9.3 vs 9.2. GPT-6.1 Terra (low) has the lower benchmark cost at $0.221 vs $4.809. GPT-6.1 Terra (low) is faster at 6.05s vs 39.86s, with pass rates of 88.4% vs 85.5%.

Last updated at: 2026-10-26

Compared models

Rank
#38
Total Output Tokens
130,107
Response Time (avg)
39.86s
Total Cost
$4.809
Rank
#33
Total Output Tokens
12,656
Response Time (avg)
6.05s
Total Cost
$0.221
Recommended model GPT-6.1 Terra (low)

It has the best score here (9.3), while costing about 21.8x less than GPT-5.5 (medium).

Detailed comparison

Metric GPT-5.5 GPT-5.5 medium Release: 2026-04-24 GPT-6.1 Terra GPT-6.1 Terra low Release: 2026-10-26
Score 9.2 9.3
Rank #38 #33
Reliability 10.0 10.0
Consistency 9.0 9.7
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 88.4% 85.5%
Flaky tests 3 1
Total Runs 69 69
Cost per result 25.306 1.162
Total Cost $4.809 $0.221
Input Price $5.000 / 1M $1.000 / 1M
Output Price $30.000 / 1M $5.000 / 1M
Cache Read Price $0.500 / 1M $0.050 / 1M
Cache Write Price N/A $1.250 / 1M
Total Input Tokens 180,959 157,463
Output Tokens 6,472 4,879
Reasoning Tokens 123,635 7,777
Response Time (avg) 39.86s 6.05s
Response Time (max) 332.10s 43.50s
Response Time (total) 916.82s 139.21s
Parameters ~1.5T total (~100B active) ~1T total (~60B active)
Availability Closed Closed

Cache prices apply to input tokens. Reads reuse cached prompts; writes store them and can cost extra. Output tokens use the output price.

Model generation showcase

Hamster playing table tennis

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

#38 GPT-5.5

medium
Cost
$0.112
Time
71.9s
Tokens
3,807 tok

#33 GPT-6.1 Terra

low
Cost
$0.011
Time
24.9s
Tokens
2,238 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

Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.5 8.8 7.8 88.9% 1 59.77s 7,305 362 24,959
GPT-6.1 Terra 10.0 10.0 100.0% 0 3.51s 7,302 393 938

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