Short answer: not as a dependable, currently documented ChatGPT option. As of November 12, 2026, OpenAI’s Free-tier FAQ lists GPT-5.6 Luna for Free users. OpenAI also says its August 6 update replaced GPT-5.5 Instant in ChatGPT with GPT-5.6 models. Direct GPT-5.5 API use is separate and usage-billed: the listed standard rates are $5 per million input tokens and $30 per million output tokens. (Free Tier FAQ; August model update; API pricing)
Can you use GPT-5.5 free in ChatGPT?
OpenAI’s current Free-tier documentation names GPT-5.6 Luna as the model available to Free users and notes that models and limits can change. In its August 6, 2026 update, OpenAI said the new GPT-5.6 models would replace GPT-5.5 Instant in ChatGPT. So the current Free-tier documentation does not promise GPT-5.5 Instant access. (Free Tier FAQ; August model update)
OpenAI’s April 2026 launch announcement had said GPT-5.5 was rolling out to Plus, Pro, Business, and Enterprise users, and GPT-5.5 Pro to Pro, Business, and Enterprise users. That is historical rollout information, not confirmation of current access. The current material cited here establishes that GPT-5.5 Instant was replaced, but does not settle whether GPT-5.5 Pro or another GPT-5.5 variant remains available in ChatGPT. Don’t subscribe on the assumption that a paid ChatGPT plan currently provides GPT-5.5; confirm the exact model in your plan’s model picker or with OpenAI first. (GPT-5.5 launch announcement)
Does GPT-5.5 cost money through the API?
Yes. Direct OpenAI API use is billed separately from ChatGPT subscriptions. OpenAI lists the GPT-5.5 API snapshot as gpt-5.5-2026-04-23, with standard text-token rates of $5 per 1 million input tokens, $0.50 per 1 million cached input tokens, and $30 per 1 million output tokens, in USD. OpenAI describes GPT-5.5 as a model for complex professional work, including coding and work with tools. (GPT-5.5 API model page)
A ChatGPT subscription does not automatically make API usage free. OpenAI describes a separate API-credit benefit for eligible paid Pro and Business subscribers; eligibility and credit amounts depend on the plan. That is not the same as free API access for all ChatGPT users. (API credits benefit)
Example API budget
Suppose a workload uses 1 million uncached input tokens and 250,000 output tokens in a billing period, with no individual request exceeding 272,000 input tokens:
- Input: 1 × $5 = $5.00
- Output: 0.25 × $30 = $7.50
- Estimated total: $12.50 USD
This is an arithmetic example, not a quote for your workload. It excludes cached-input savings and separately billed tools. OpenAI says prompts exceeding 272,000 input tokens incur higher input and output rates for the full session; regional-processing endpoints also carry a 10% uplift for GPT-5.5. Check the live API pricing information and your expected token use before setting a production budget. (GPT-5.5 API model page; API pricing)
What about a third-party “free GPT-5.5” offer?
A hosted product or promotion is separate from free access to OpenAI’s API. For example, Felo’s April 27, 2026 blog post advertised GPT-5.5 through Felo Agent as free, but did not state usage caps or offer terms. Treat that as a dated, provider-specific claim: confirm current availability, the exact model, limits, and terms directly with the provider. Don’t use an unverified promotion as the basis for a production API budget. (Felo’s announcement)
Bottom line
- ChatGPT Free: OpenAI’s current Free-tier FAQ lists GPT-5.6 Luna, not GPT-5.5 Instant; OpenAI says GPT-5.6 replaced GPT-5.5 Instant in ChatGPT.
- Other GPT-5.5 ChatGPT variants: The sources cited here do not confirm whether GPT-5.5 Pro or another GPT-5.5 variant remains available in ChatGPT. Verify before paying for a plan to get one.
- OpenAI API: GPT-5.5 is usage-billed. Standard rates are $5/M input, $0.50/M cached input, and $30/M output tokens.
- Third-party offers: A provider may advertise free hosted access, but that does not make direct OpenAI API use free or establish production-ready limits.
OpenAI model availability and prices can change; confirm the current model picker and API pricing before making a purchase or committing to a production budget.