Which AI Image Gen Has Best Character Consistency? OpenAI vs. Gemini vs. Flux
A recent comparison of AI image generators evaluated their character consistency across various tests. FLUX.2 and Gemini 3.1 Flash emerged as the top performers, while Runway Gen-4 struggled significantly. The study highlights the challenges of maintaining character consistency in AI-generated images, particularly with human subjects.
- ▪FLUX.2 and Gemini 3.1 Flash produced the strongest character consistency across three tests.
- ▪FLUX.2 won the tests for placing a person in a new scene and adding clothing items accurately.
- ▪Gemini 3.1 Flash excelled in generating a stylized character consistently across multiple frames.
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| Original publisher | Hacker News (AI / LLM) |
| Canonical URL | https://techstackups.com/comparisons/gemini-vs-openai-vs-flux-vs-runway-character-consistency-may-2026/ |
| Publication time | Mon, 18 May 2026 15:46:21 +0000 |
| Retrieval time | 2026-05-18T15:59:56.632Z |
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Which AI Image Generator Has the Best Character Consistency? OpenAI vs Gemini vs Black Forest Labs vs Runway (May 2026)May 18, 2026 · 36 min readJames Daniel WhitfordSoftware engineer and technical writer Note: This article was originally published using OpenAI's gpt-image-1. It has been updated to use gpt-image-2. FLUX.2 and Gemini 3.1 Flash produce the strongest character consistency across our three tests. gpt-image-2 comes in third and Runway Gen-4 last. Character consistency is one of the hardest problems in AI image generation. Getting a model to place the same person in a new scene without their features drifting is something users expect and models regularly fail at.
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