Canonical page: https://mixerai.org/en/knowledge/compare/gpt-text-vs-gemini-3-5-flash/ [Mixer AI](https://mixerai.org/) › [Knowledge Base](https://mixerai.org/en/knowledge/) › [Comparison](https://mixerai.org/en/knowledge/compare/) › GPT vs Gemini 3.8 Flash: AI chat model comparison # GPT vs Gemini 3.8 Flash: AI chat model comparison This compares two chat models in the current Mixer AI knowledge base. Review available versions, image support and specialized modes, then test both on the same request instead of inventing one universal winner. Updated 2026-10-02 [Try it on Mixer AI](https://mixerai.org/?dl=kb_gpt-text-vs-gemini-3-5-flash#/canvas) ## Key differences GPT: Turn a brief, notes and images into a draft, plan or clear set of decisions. Gemini 3.8 Flash: Analyze images and text together, from describing a frame to checking a brief. Start with the specification table: it reflects current modes, input media, duration, resolution, aspect ratios and a normalized price where a fair comparison is possible. ## Specifications | Feature | GPT | Gemini 3.8 Flash | Versions | GPT 6 Astra / GPT 6 Luna / GPT 6 Sol / GPT 6.1 Sol / GPT 5.6 Sol / GPT 5.6 Terra / GPT 5.6 Luna | Gemini 3.8 Flash / Gemini 3.1 Pro | Image analysis | Yes | Yes | Fast mode | No | Yes ## What to compare in the answers Give both models the same request and the same context. Compare instruction following, factual care, response structure, long-context handling, image analysis when available, and whether uncertainty is communicated usefully. ## What to inspect with GPT Turn a brief, notes and images into a draft, plan or clear set of decisions. - GPT 6 Astra, GPT 6 Luna, GPT 6 Sol, GPT 6.1 Sol and the GPT 5.6 family are separate choices in Canvas. - Connect up to 5 text blocks and 10 images. This tool produces text, not a new image. - Canvas saves answers up to 3400 characters. Work on larger material in sections. - The pre-request amount is an estimate; final billing uses actual usage. Answers can contain errors. ## What to inspect with Gemini 3.8 Flash Analyze images and text together, from describing a frame to checking a brief. - Gemini 3.8 Flash and Gemini 3.1 Pro are available in Canvas text tools. - Up to 5 text blocks and 10 images. Capabilities in other Gemini interfaces do not change this tool's inputs. - Canvas answers are limited to 3400 characters. Split a larger analysis into parts. - Small lettering and image numbers can be misread; do not use the answer as the only check. ## How to run a fair comparison - Use the same system context and user request for both models. - For image tests, attach the same file and ask the same question about it. - Score reasoning quality, factual accuracy, response format and speed separately. - Repeat difficult tests: one good answer does not prove consistent model behavior. ## Sources Prices, availability and specifications come from the Mixer AI catalog. This is not an independent test: try both models on the same task before choosing. - [Prices and availability — Mixer AI catalog](https://mixerai.org/knowledge/catalog.json) ## What we compare [ GPT Turn a brief, notes and images into a draft, plan or clear set of decisions. ](https://mixerai.org/en/knowledge/text/gpt-text/)[ Gemini 3.8 Flash Analyze images and text together, from describing a frame to checking a brief. ](https://mixerai.org/en/knowledge/text/gemini-3-5-flash/) ## FAQ How should I compare GPT and Gemini 3.8 Flash fairly? Give both models the same request, context and attachments. Score accuracy, reasoning quality, response format and repeatability separately. Are both models available in Mixer AI? Yes. This page is generated only for models in the current public Mixer AI catalog; if a model leaves the catalog, the automated comparison must stop passing validation. Which model is better? There is no universal answer. First exclude a model that lacks a required capability, such as image analysis or the version you need, then compare both on your typical requests. ## See also [GPT vs Claude: AI chat model comparison→](https://mixerai.org/en/knowledge/compare/gpt-text-vs-claude-text/)[GPT vs Grok 4.7: AI chat model comparison→](https://mixerai.org/en/knowledge/compare/gpt-text-vs-grok-4-5/)[Claude vs Gemini 3.8 Flash: AI chat model comparison→](https://mixerai.org/en/knowledge/compare/claude-text-vs-gemini-3-5-flash/)[Grok 4.7 vs Gemini 3.8 Flash: AI chat model comparison→](https://mixerai.org/en/knowledge/compare/grok-4-5-vs-gemini-3-5-flash/) [Try it on Mixer AI](https://mixerai.org/?dl=kb_gpt-text-vs-gemini-3-5-flash#/canvas)