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

Claude Fable 5.1 (low) leads on average score with 6.9 vs 6.8. Step 3.7 Flash (high) has the lower benchmark cost at $1.229 vs $2.565. Claude Fable 5.1 (low) is faster at 10.33s vs 70.10s, with pass rates of 56.1% vs 60.6%.

Last updated at: 2026-09-02

Rank
#130
Total Output Tokens
24,375
Response Time (avg)
10.33s
Total Cost
$2.565
Rank
#135
Total Output Tokens
1,050,900
Response Time (avg)
70.10s
Total Cost
$1.229
Recommended model Claude Fable 5.1 (low)

It has the best score here (6.9), while responding about 6.8x faster than Step 3.7 Flash (high).

Detailed comparison

Metric Claude Fable 5.1 Claude Fable 5.1 low Release: 2026-09-02 Step 3.7 Flash Step 3.7 Flash high Release: 2026-05-29
Score 6.9 6.8
Rank #130 #135
Reliability 10.0 10.0
Consistency 9.2 8.4
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 56.1% 60.6%
Flaky tests 2 4
Total Runs 66 66
Cost per result 23.315 11.167
Total Cost $2.565 $1.229
Input Price $10.000 / 1M $0.200 / 1M
Output Price $50.000 / 1M $1.150 / 1M
Total Input Tokens 134,582 98,700
Output Tokens 8,955 1,050,900
Reasoning Tokens 15,420 0
Response Time (avg) 10.33s 70.10s
Response Time (max) 33.10s 364.99s
Response Time (total) 227.37s 1542.14s
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.

#130 Claude Fable 5.1

low
Cost
$0.126
Time
28.5s
Tokens
2,652 tok

#135 Step 3.7 Flash

high
Cost
$0.007
Time
63.6s
Tokens
6,030 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 3.4 10.0 0.0% 0 6.75s 10,608 1,753 0
Step 3.7 Flash 4.0 6.0 22.2% 1 206.21s 6,057 327,340 0

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