Is Claude Opus 5.5 free?
Search results for "Claude Opus 5.5 free" are full of sites promising unlimited access with no sign-up. Those are not Anthropic, and there is no way for a third party to give away a model that costs $20 per million output tokens indefinitely without either limiting you, logging your data or serving something else. Here is what is actually available and what it costs.
Every way to use Opus 5.5, and what it costs
Subscription prices change often; check claude.com/pricing for the current figures. The API prices below are Anthropic’s list and ours as of 30 September 2026.
| Route | Opus 5.5 included? | Cost |
|---|---|---|
| claude.ai Free | No (Sonnet / Haiku tier only) | $0 |
| claude.ai Pro / Max / Team | Yes, with usage limits | monthly subscription |
| Anthropic API | Yes | $4 / $20 per 1M tokens |
| New-account or cloud credits | Yes, until the credit runs out | free, finite |
| apimodels.app new account | Yes, $0.1 credit: a few short answers | free, once per new account |
| apimodels.app API | Yes (claude-opus-5-5) | $2.40 / $12 per 1M tokens, no subscription |
The most affordable way if you only need it sometimes
A subscription makes sense if you chat with Claude every day. If you need Opus 5.5 for a few coding sessions or API jobs a week, per-token billing costs less: a coding turn that sends 50,000 input tokens, mostly cached, and returns 3,000 tokens costs a few cents on apimodels.app. You can also use it in Claude Code by pointing ANTHROPIC_BASE_URL at https://api.apimodels.app.
If Opus 5.5 is more than you need, Sonnet-tier models are on the free claude.ai plan and cost half as much on the API. See the Opus 5.5 vs Sonnet 5.5 comparison for where the smaller model is enough.
Início rápido
cURL
curl https://api.apimodels.app/v1/messages \
-H "x-api-key: $APIMODELS_API_KEY" \
-H "anthropic-version: 2023-06-01" \
-H "Content-Type: application/json" \
-d '{"model": "claude-opus-5-5", "max_tokens": 4000,
"messages": [{"role": "user", "content": "Summarise the risks in this pull request: ..."}]}'Perguntas frequentes
Is Claude Opus 5.5 free on claude.ai?
No. The free plan offers Sonnet- and Haiku-tier models. Opus 5.5 is included with Pro and higher plans, subject to usage limits.
Is there a free Claude Opus 5.5 API?
Only finite credits. New apimodels.app accounts get $0.1 free, enough for a few short answers; Anthropic and cloud platforms offer new-account or promotional credits. After that it is paid per token: $4 / $20 per million at Anthropic or $2.40 / $12 on apimodels.app.
How far does the $0.1 free credit go with Opus 5.5?
A 1,000-token question with a 1,500-token reply costs about $0.02 at $2.40 / $12 per million, so the credit covers a few short answers. Keep max_tokens at about 6,000 or less while you are on it: before each call the balance has to cover the maximum output plus a 20% margin, so a larger max_tokens is refused with a 402 even when the actual reply would be short. Claude Code asks for much longer outputs, so top up before pointing it at apimodels.app. Failed calls are not charged.
Are "free Opus 5.5 chat" websites safe?
Treat them with caution. They are not run by Anthropic, you cannot verify which model answers, and anything you paste may be logged. Do not send code, keys or personal data to them.
What is the most affordable way to use Opus 5.5?
For occasional use, pay-as-you-go API access: $2.40 / $12 per million tokens on apimodels.app, 40% below Anthropic’s list, no subscription and no charge for failed calls. For daily chat use, a claude.ai Pro subscription may work out more affordable.
Relacionado
- Claude Opus 5.5 model page ($2.40 / $12)
- Opus 5.5 vs Sonnet 5.5: benchmarks and which to use
- Claude Sonnet 5.5 pricing and cost per task
- Opus 5.5 vs Fable 5.1: is Fable still worth it
- Opus 5.5 vs GPT-6 and GPT-6.1
- Claude Code with Opus 5.5: setup and cost
- Making videos with Opus 5.5 (tested)
