Comparing 2 models

Claude Fable 5 vs GPT-5.6 Luna

Facts first, then task-specific rankings. A highlighted cell is better only for that row, not universally.

metric

Model 1Claude Fable 5

Model 2GPT-5.6 Luna

Best for

Agentic Coding (#1)

Code Completion (#1)

Provider

anthropic

openai

Context

1.1MBest

Input / 1M

$10

$0.20Best

Output / 1M

$50

$1.20Best

Tool use

yesBest

Vision

yesBest

Reasoning

yesBest

Open-weight

—

Released

Jun 7, 2026

Jul 9, 2026

task evidence

How they place when the question changes

Lower ranks are better. “Best” marks the strongest option in this shortlist for that task.

Best LLM for Grounded RAG #3Best —

Best LLM for Creative Writing #1Best —

Best LLM for Everyday Translation #1Best —

Best LLM for Hermes Agent #2Best —

Best LLM for JSON & Schema Output #3 #1Best

Best LLM for Roleplay & Character #1Best —

Best LLM for Marketing Copy #1Best —

Best LLM for Massive Context #4 #2Best

Best LLM for Business Writing #1Best —

Best LLM for Translation #1Best —

Best LLM for Image Understanding #1Best #6

Best LLM for OpenClaw #2Best #3

Best LLM for Coding #1Best —

Best LLM for Math & Reasoning #1Best —

Best LLM for Writing #1Best —

Best Cheap LLM for High Volume #4 #2Best

Best LLM for High-Volume Extraction #3 #2Best

Best LLM for Document Summarization #4Best —

Best Value LLM —#4Best

Best LLM for Document Parsing #1Best #5

Best LLM for Agentic Coding #1Best #4

Best LLM for RAG & Long Context #3Best —

Best LLM for Competition Math #1Best —

Best LLM for Autonomous Agents #2Best #3

Best LLM for Goose #2Best —

Best LLM for Charts & Diagrams #1Best #3

Best LLM for Code Completion #3 #1Best

Best LLM for Chat & Roleplay #1Best —

Best LLM for OpenHands #2Best —

Best LLM for Computer & Browser Use #3Best #5

Best LLM for Tool & Function Calling #6 #5Best

Best LLM for Summarization #3Best —

Best LLM for a General Assistant #2Best —

Cheapest Capable LLM #6Best —

Best LLM for Logic & Problem Solving #1Best —

Best LLM for Debugging & Code Review #2Best #7

Best LLM for Structured Data Extraction #4 #1Best

Best LLM for OCR & Documents #1Best —

Best LLM for AI Agents #2Best #5

Best LLM for Literary Translation #1Best —

Best LLM for Fast Summaries #6Best —