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Claude Fable 5 (medium) vs Grok 4.5 (medium)

Claude Fable 5 (medium) leads on average score with 8.6 vs 8.5. Grok 4.5 (medium) has the lower benchmark cost at $2.042 vs $3.004. Claude Fable 5 (medium) is faster at 15.01s vs 68.59s, with pass rates of 78.8% vs 83.3%.

Last updated at: 2026-08-20

Rank
#33
Total Output Tokens
42,146
Response Time (avg)
15.01s
Total Cost
$3.004
Rank
#37
Total Output Tokens
299,460
Response Time (avg)
68.59s
Total Cost
$2.042
Recommended model Claude Fable 5 (medium)

It has the best score here (8.6), while responding about 4.6x faster than Grok 4.5 (medium).

Detailed comparison

Metric Claude Fable 5 Claude Fable 5 medium Release: 2026-06-10 Grok 4.5 Grok 4.5 medium Release: 2026-07-08
Score 8.6 8.5
Rank #33 #37
Reliability 10.0 10.0
Consistency 9.6 8.9
Attempts 66/66 66/66
Tests Correct
Attempt pass rate 78.8% 83.3%
Flaky tests 1 3
Total Runs 66 66
Cost per result 17.669 12.007
Total Cost $3.004 $2.042
Input Price $10.000 / 1M $2.000 / 1M
Output Price $50.000 / 1M $6.000 / 1M
Total Input Tokens 89,640 122,155
Output Tokens 33,092 5,514
Reasoning Tokens 9,054 293,946
Response Time (avg) 15.01s 68.59s
Response Time (max) 80.80s 436.38s
Response Time (total) 330.15s 1508.91s
Parameters ~9.5T total (~878B active) ~1.7T total (~170B active)
Availability Closed Closed

Model generation showcase

Hamster playing table tennis

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

#33 Claude Fable 5

medium
Cost
$0.606
Time
156.7s
Tokens
12,264 tok

#37 SpaceXAI: Grok 4.5

medium
Cost
$0.044
Time
59.4s
Tokens
7,512 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 10.0 10.0 100.0% 0 15.59s 10,590 7,383 1,318
Grok 4.5 7.6 7.2 77.8% 1 155.69s 9,579 390 104,634

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