GPT-5.5API
OpenAI GPT-5.5 — flagship reasoning and agentic tool use.
Input price
$2.00
per 1M tokens
Output price
$12.00
per 1M tokens
Single upstreamServed through one supplier today. If that supplier has an outage, calls fail until it recovers — failed calls are never billed. We're adding a second supplier to every text model.
Prompt caching
Pass cache_control on a stable prefix and cache hits bill at a fraction of input. Cache writes bill at the vendor's write rate — 1.25× input on Claude and GPT-5.6+, the input rate elsewhere.
Auto-derived from input × 0.1
Prompts over 272K tokens bill the whole request at $4 in / $18 out per 1M.
Specs
- Model ID
gpt-5-5- Endpoint
POST /v1/chat/completions- Category
- Text
- Provider
- OpenAI
- Context window (tokens)
- 1,050,000
- Max output (tokens)
- 128,000
- Capabilities
- Tool callingStreamingReasoningLong context
Drop-in OpenAI compatibility
Point your existing OpenAI SDK at api.kunavo.com/v1 and swap the model id. No streaming changes, no SDK changes.
View docsGPT API pricing guideTry it
Set KUNAVO_API_KEY from /app/keys, then run any of the snippets below.
curl https://api.kunavo.com/v1/chat/completions \
-H "Authorization: Bearer $KUNAVO_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5-5",
"messages": [
{"role": "user", "content": "Hello, GPT-5.5"}
],
"stream": false
}'Kunavo vs calling OpenAI directly
Same GPT-5.5 weights, same responses. What a gateway changes is the account, the SDK and the bill — here is the honest side-by-side.
| Kunavo | OpenAI direct | |
|---|---|---|
| Price (per 1M tokens) | $2.00 / $12.00 (−60%) | $5.00 / $30.00 |
| Account | One Kunavo account, key in 2 minutes, $10 minimum top-up | A OpenAI account plus its own billing setup |
| SDK | Keep the OpenAI SDK — change base_url, set model to "gpt-5-5" | OpenAI's SDK, or their OpenAI-compatible layer where offered |
| Same key also reaches | Claude, GPT, image, video and audio models | OpenAI's own catalog only |
| Billing | One Stripe balance, pay-as-you-go, never expires; failed requests unbilled | A separate invoice per provider |
| Rate limits | Shared gateway capacity, no contractual per-account limit | OpenAI's own tier limits, raised by usage history or contract |
Go direct to OpenAI when you need a contractual rate limit, an enterprise SLA, or a provider-only feature on day one. Use Kunavo when you want one key, one balance and a lower per-token rate across every provider.
Frequently asked questions
How much does GPT-5.5 cost?
On Kunavo, GPT-5.5 is $2.00 per 1M input tokens and $12.00 per 1M output tokens — about 60% under OpenAI's official price. Failed requests are never billed, and you pay as you go only for successful calls.
Can I call GPT-5.5 with the OpenAI SDK?
Yes. Set base_url to https://api.kunavo.com/v1, use your Kunavo key, and set model to "gpt-5-5". Requests and responses are OpenAI-compatible
What endpoint does GPT-5.5 use?
Call GPT-5.5 through POST /v1/chat/completions on Kunavo’s OpenAI-compatible API.
What is GPT-5.5 good for?
GPT-5.5 is a text model from OpenAI, with support for Tool calling, Streaming, Reasoning, and Long context.
What is different from calling OpenAI directly?
The model is the same — about 60% under OpenAI's official price. The surrounding setup changes: one key and one Stripe balance replace a OpenAI account and its billing, you can use the OpenAI SDK by changing base_url, and the same key also reaches Claude, GPT, image, video and audio models. Gateway capacity is shared. If your use case requires provider-negotiated limits for GPT-5.5, contact OpenAI directly.
Is GPT-5.5 cheaper on Kunavo?
Yes. GPT-5.5 is about 60% below OpenAI’s official list price on Kunavo, with no subscription or monthly minimum. You pay for successful usage, starting with a $10 top-up; failed requests are never billed and your balance never expires.