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Claude Fable 5.1 (high) vs GPT-5.6 Terra (low)

The average score is effectively tied at 7.9 vs 7.9. GPT-5.6 Terra (low) has the lower benchmark cost at $0.645 vs $3.471. GPT-5.6 Terra (low) is faster at 7.58s vs 13.30s, with pass rates of 85.5% vs 75.4%.

Last updated at: 2026-10-01

Compared models

Rank
#98
Total Output Tokens
40,466
Response Time (avg)
13.30s
Total Cost
$3.471
Rank
#95
Total Output Tokens
24,213
Response Time (avg)
7.58s
Total Cost
$0.645
Recommended model GPT-5.6 Terra (low)

It has the best score here (7.9), while costing about 5.4x less than Claude Fable 5.1 (high).

Detailed comparison

Metric Claude Fable 5.1 Claude Fable 5.1 high Release: 2026-09-02 GPT-5.6 Terra GPT-5.6 Terra low Release: 2026-07-09
Score 7.9 7.9
Rank #98 #95
Reliability 10.0 10.0
Consistency 9.7 8.0
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 85.5% 75.4%
Flaky tests 1 6
Total Runs 69 69
Cost per result 18.264 5.277
Total Cost $3.471 $0.645
Input Price $10.000 / 1M $2.000 / 1M
Output Price $50.000 / 1M $12.000 / 1M
Total Input Tokens 144,676 176,890
Output Tokens 8,184 5,688
Reasoning Tokens 32,282 18,525
Response Time (avg) 13.30s 7.58s
Response Time (max) 40.17s 54.57s
Response Time (total) 305.83s 174.39s
Parameters ~9.5T total (~878B active) ~1T total (~60B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#98 Claude Fable 5.1

high
Cost
$0.384
Time
102.5s
Tokens
7,824 tok

#95 GPT-5.6 Terra

low
Cost
$0.034
Time
16.8s
Tokens
2,348 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
Claude Fable 5.1 8.4 7.4 88.9% 1 13.91s 10,608 520 6,503
GPT-5.6 Terra 6.6 4.6 77.8% 2 9.56s 7,302 429 6,821

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