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: 80% (Top 1%)Code Elo: 1,622 (Top 1%)Elo: 1,616 (Top 2%)

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-bench79.2%Code Elo1,618Elo1,624

Rank #2 in stackvs #1

#3Claude Opus 4.8(Anthropic)

Score 95.0

SWE-bench78.4%Code Elo1,604Elo1,598

Rank #3 in stackvs #1

#4GPT-5.6 Sol(OpenAI)

Score 94.4

SWE-bench77.6%Code Elo1,602Elo1,608

Rank #4 in stackvs #1

#5OpenAI: o3 Mini(OpenAI)

Score 93.4

SWE-bench78.5%Code Elo1,585Elo1,560

Rank #5 in stackvs #1

#6Claude Opus 4.5(Anthropic)

Score 90.6

SWE-bench76.8%Code Elo1,574Elo1,568

Rank #6 in stackvs #1

#7GLM-5.3(Zhipu)

Score 90.3

SWE-bench76.4%Code Elo1,586Elo1,558

Rank #7 in stackvs #1

#8Claude Opus 4.6(Anthropic)

Score 89.4

SWE-bench75.9%Code Elo1,570Elo1,574

Rank #8 in stackvs #1

#9Gemini 3.6 Pro(Google)

Score 85.5

SWE-bench74.6%Code Elo1,566Elo1,570

Rank #9 in stackvs #1

#10Claude Sonnet 5(Anthropic)

Score 82.5

SWE-bench73.8%Code Elo1,562Elo1,556

Rank #10 in stackvs #1