Claude Fable 5.1 vs GPT-Image-2.5 (Sunburst)
A direct, empirical evaluation of Claude Fable 5.1 (Anthropic) against GPT-Image-2.5 (Sunburst) (OpenAI).
Claude Fable 5.1
Developed by Anthropic · Proprietary Frontier parameters
Full-repository software refactoring, agentic tool workflows, formal verification, and 1.5M-token needle retrieval.
GPT-Image-2.5 (Sunburst)
Developed by OpenAI · Proprietary Multimodal DiT parameters
High-fidelity typographic rendering, raytracing reflection accuracy, sketch-to-image conditioning, and localized comment inpainting.