What is ChatGPT Images 2.5 and how does it improve over previous OpenAI image models?

ChatGPT Images 2.5 is OpenAI’s updated image generation and editing system deployed across consumer ChatGPT and developer API endpoints. It delivers 50% lower generation latency, improved skin and fabric micro-textures, structural sketch reference inputs, and pin-point comment edits that preserve character identity across turns.

What is the difference between GPT-Image-2.5 Flare and GPT-Image-2.5 Sunburst?

GPT-Image-2.5 Flare is a distilled 4-step flow matching model engineered for sub-2-second conversational experiences, interactive design mocks, and real-time previews. GPT-Image-2.5 Sunburst is a full-precision 32-step diffusion transformer calibrated for crisp typography, accurate physics reflections (e.g. mirrors and curved glass), and high-resolution print graphics.

How does the Sketch feature work in ChatGPT Images 2.5?

The Sketch tool allows users to draw or upload lines and composition guides on an interactive canvas. The model processes the stroke geometry as an auxiliary spatial conditioning map alongside text prompts, aligning character poses, horizon lines, and furniture positions directly with the sketch.

Can ChatGPT Images 2.5 maintain consistent characters across multiple generations?

Yes. Community stop-motion evaluations and official benchmarks confirm that ChatGPT Images 2.5 locks character identity, hair structure, and facial bone geometry across sequential prompts by retaining spatial latent seed coordinates and identity cross-attention embeddings.

What is the API pricing for ChatGPT Images 2.5 models?

In the OpenAI API, gpt-image-2.5-flare costs $0.020 per 1024×1024 image ($0.015 for 512×512), while gpt-image-2.5-sunburst costs $0.070 per 1024×1024 image ($0.090 for 1792×1024 widescreen). Inpainting and edit requests bill at standard per-generation image rates.

ChatGPT Images 2.5 Deep Report: Flare, Sunburst, Benchmarks & API Guide

A technical analysis of OpenAI’s ChatGPT Images 2.5. Covers the 50% generation latency reduction, Flare and Sunburst API architectures, Arena.ai No. 1 placement, sketch-to-image conditioning, localized comment-based inpainting, character consistency in sequential frames, and production API pricing.

# OpenAI Launches ChatGPT Images 2.5: 50% Faster Generation, Flare vs Sunburst API Models, and Arena.ai Benchmarks On September 9, 2026, OpenAI launched **ChatGPT Images 2.5**, rolling out the updated generation and editing engine to all free, Plus, Team, and Enterprise accounts, alongside dedicated API models for developers. The release addresses two historical weaknesses in synthetic image generation: multi-second generation latency and destructive full-canvas inpainting during edits. By combining distilled flow matching with coordinate-targeted editing tools, ChatGPT Images 2.5 halves inference time while providing precise control over character consistency, drawing sketches, and localized modifications. This technical report analyzes the mathematical foundations of the updated architecture, compares the **Flare** and **Sunburst** API models, reviews Arena.ai benchmark rankings, and outlines production integration code. --- ## 1. Architectural Foundations: Flow Distillation and...