Deterministic Stack Engine

Best AI Stack for highest coding accuracy

SWE-bench first with no budget cap. For when the patch quality matters more than the invoice.

Objective Weight Distribution

SWE-bench:55%Code Elo:25%Elo:20%

Recommended PickScore 98.8 / 100

Claude Fable 5

Anthropic · Closed flagship

swe bench p99elo coding p99elo p98

Output: $50/1MSWE-bench: 80%

View full model fact sheet

Full Stack Leaderboard

Ranked alternatives optimized for highest coding accuracy based on objective benchmark weighting.

#2Claude Opus 5(Anthropic)

Score 98.0

swe benchP98elo codingP97eloP99

Rank #2 in stackvs #1

#3Claude Opus 4.8(Anthropic)

Score 95.0

swe benchP95elo codingP95eloP95

Rank #3 in stackvs #1

#4GPT-5.6 Sol(OpenAI)

Score 94.2

swe benchP94elo codingP93eloP96

Rank #4 in stackvs #1

#5OpenAI: o3 Mini(OpenAI)

Score 92.7

swe benchP96elo codingP89eloP88

Rank #5 in stackvs #1

#6Claude Opus 4.5(Anthropic)

Score 90.1

swe benchP92elo codingP87eloP89

Rank #6 in stackvs #1

#7GLM-5.3(Zhipu)

Score 90.0

swe benchP91elo codingP91eloP86

Rank #7 in stackvs #1

#8Claude Opus 4.6(Anthropic)

Score 88.6

swe benchP89elo codingP85eloP92

Rank #8 in stackvs #1

#9Gemini 3.6 Pro(Google)

Score 85.2

swe benchP85elo codingP81eloP91

Rank #9 in stackvs #1

#10Claude Sonnet 5(Anthropic)

Score 82.2

swe benchP83elo codingP79eloP84

Rank #10 in stackvs #1