ChatGPT 5.5 ⌄

ChatGPT 5.5

Earlier OpenAI flagship; compare it with GPT-5.6 Sol.

This is an earlier model. ChatGPT 5.6 Sol is the current OpenAI model and is faster and more capable. ChatGPT 5.6 Sol

Hardest reasoning task Plan, then solve

Deep code review Bugs & architecture

Rigorous research Evidence-based report

Long-form writing Holds tone & structure

About ChatGPT 5.5 — examples and limitations

GPT-5.5 was OpenAI's flagship before the GPT-5.6 and GPT-6 families: stronger reasoning, sharper instruction-following and more reliable long-form output than GPT-5.

This page covers ChatGPT 5.5 specifically. To choose among OpenAI versions or start from the general entry point, visit the ChatGPT model hub.

ChatGPT 5.5 at a glance

Provider	OpenAI
Access on AskAI.free	Premium model; the 7-day Pro trial unlocks access.
Best first test	Comparing an established GPT-5.5 workflow with the newer GPT-5.6 family
Model position	Earlier release; compare it with ChatGPT 5.6 Sol.

What makes ChatGPT 5.5 different

GPT-5.5 remains useful as a reference point between GPT-5 and the newer 5.6 family. Existing users can compare its style and instruction-following, but new high-stakes work should normally start with GPT-5.6 Sol or Terra. Keeping this route preserves access without pretending it is the newest release.

What ChatGPT 5.5 is best for

Comparing an established GPT-5.5 workflow with the newer GPT-5.6 family
Long reports and technical writing created for this model generation
Code review where compatibility with earlier outputs matters
Testing how instruction-following changed between GPT-5 and GPT-5.6
Reproducing or continuing work that specifically used GPT-5.5

How to use ChatGPT 5.5

Step 1 Bring GPT-5.5 the whole problem: full background, goal and constraints in one message - GPT-5.5 reasons best when it sees everything at once.

Step 2 Ask it to plan before it answers: have it outline the approach, flag assumptions and weigh tradeoffs, then execute the plan in the same conversation.

Step 3 Use follow-ups to stress-test conclusions, ask for a more rigorous pass, or turn the analysis into a finished long-form deliverable.

Example prompts

Unlimited ChatGPT 5.5, free for 7 days

You are on the free tier. Go unlimited on every premium model, with image and PDF uploads and saved history. No charge today, cancel anytime.

Unlimited use
Premium models
No ads
7-day free trial
Cancel anytime

See all plans →

Frequently asked questions

Is ChatGPT 5.5 the current flagship?

No. GPT-5.5 is an earlier release retained for comparison and existing workflows. Start new demanding work with GPT-5.6 Sol or a GPT-6 model.

What changed from GPT-5 to GPT-5.5?

GPT-5.5 improved reasoning, instruction-following and long-form reliability over GPT-5, but it has since been superseded by the GPT-5.6 family.

Should I use GPT-5.5 or GPT-5.6 Sol?

Use GPT-5.6 Sol for difficult new work. Use GPT-5.5 when you need to compare model behavior or continue a workflow built around its output style.

Can ChatGPT 5.5 browse the web?

Not on this platform. For real-time web search, switch to one of the Perplexity search models in your sidebar.

Related tools and comparisons

Try other AI models free

More questions about AI models? Read our AI Models FAQ - ChatGPT, Claude & Gemini: comparisons, picks for coding/writing, and what each model is best at.

Want the whole lineup on one page? The AI Chatbot hub lists every model here with what it is best at, which ones are free, and the specialist bots built on them.