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Claude Fable 5.1 (high) vs Step 3.7 Flash (medium)

Claude Fable 5.1 (high) leads on average score with 7.9 vs 7.8. Step 3.7 Flash (medium) has the lower benchmark cost at $0.571 vs $3.471. Claude Fable 5.1 (high) is faster at 13.30s vs 26.57s, with pass rates of 85.5% vs 68.1%.

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
#106
Total Output Tokens
440,835
Response Time (avg)
26.57s
Total Cost
$0.571
Recommended model Claude Fable 5.1 (high)

It has the best score here (7.9), while responding about 2.0x faster than Step 3.7 Flash (medium).

Detailed comparison

Metric Claude Fable 5.1 Claude Fable 5.1 high Release: 2026-09-02 Step 3.7 Flash Step 3.7 Flash medium Release: 2026-05-29
Score 7.9 7.8
Rank #98 #106
Reliability 10.0 10.0
Consistency 9.7 8.7
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 85.5% 68.1%
Flaky tests 1 4
Total Runs 69 69
Cost per result 18.264 4.392
Total Cost $3.471 $0.571
Input Price $10.000 / 1M $0.200 / 1M
Output Price $50.000 / 1M $1.150 / 1M
Total Input Tokens 144,676 319,524
Output Tokens 8,184 440,835
Reasoning Tokens 32,282 0
Response Time (avg) 13.30s 26.57s
Response Time (max) 40.17s 152.83s
Response Time (total) 305.83s 611.09s
Parameters ~9.5T total (~878B active) 198B total (11B active)
Availability Closed Open source

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

#106 Step 3.7 Flash

medium
Cost
$0.006
Time
46.2s
Tokens
4,466 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
Step 3.7 Flash 8.8 7.8 88.9% 1 27.42s 7,437 44,797 0

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