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Claude Fable 5.1 (medium) vs Inkling (medium)

Inkling (medium) leads on average score with 7.4 vs 7.3. Inkling (medium) has the lower benchmark cost at $0.527 vs $3.197. Claude Fable 5.1 (medium) is faster at 11.87s vs 16.98s, with pass rates of 78.3% vs 75.4%.

Last updated at: 2026-10-16

Compared models

Rank
#159
Total Output Tokens
32,506
Response Time (avg)
11.87s
Total Cost
$3.197
Rank
#156
Total Output Tokens
69,605
Response Time (avg)
16.98s
Total Cost
$0.527
Recommended model Inkling (medium)

It has the best score here (7.4), while costing about 6.1x less than Claude Fable 5.1 (medium).

Detailed comparison

Metric Claude Fable 5.1 Claude Fable 5.1 medium Release: 2026-09-02 Inkling Inkling medium Release: 2026-07-18 Free Available
Score 7.3 7.4
Rank #159 #156
Reliability 10.0 10.0
Consistency 7.9 8.2
Attempts 69/69 69/69
Tests Correct
Attempt pass rate 78.3% 75.4%
Flaky tests 6 5
Total Runs 69 69
Cost per result 21.312 3.594
Total Cost $3.197 $0.527
Input Price $10.000 / 1M $0.950 / 1M
Output Price $50.000 / 1M $4.050 / 1M
Cache Read Price $0.250 / 1M $0.160 / 1M
Cache Write Price $12.500 / 1M N/A
Total Input Tokens 157,142 257,138
Output Tokens 8,149 13,830
Reasoning Tokens 24,357 55,775
Response Time (avg) 11.87s 16.98s
Response Time (max) 36.59s 85.12s
Response Time (total) 272.91s 390.45s
Parameters ~9.5T total (~878B active) 975B total (41B active)
Availability Closed Open source

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.

#159 Claude Fable 5.1

medium
Cost
$0.244
Time
65.9s
Tokens
5,025 tok

#156 Thinking Machines: Inkling

medium
Cost
$0.004
Time
11.2s
Tokens
852 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 7.0 5.0 77.8% 2 10.99s 10,608 525 4,376
Inkling 8.4 7.8 77.8% 1 25.20s 7,374 525 14,457

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