---
title: "GPT-5.5 — API access"
description: "GPT-5.5 API pricing: official $5/$30 per 1M tokens, $2.50/$15 with the flat 50% apiToken.sale discount. Previous-generation flagship on the OpenAI-compatible endpoint."
url: "https://apitoken.sale/models/gpt-5-5"
language: "en"
---
# GPT-5.5

GPT-5.5 is the previous-generation flagship — pinned for workloads evaluated against it. During the Sol promotion it retains the higher standard $5/$30 card.

- **Model ID:** `gpt-5.5`
- **Tier:** Flagship
- **Context window:** 1.05M tokens
- **Max output:** 128K tokens
- **Official price (per 1M):** $5 input / $30 output
- **Your price (per 1M):** input $2.5, output $15 (flat 50% off)
- **Base URL:** `https://router.apitoken.sale/v1` · **Endpoints:** `POST /v1/responses`, `POST /v1/chat/completions` (Authorization: Bearer)

## Best for

- Workloads pinned to GPT-5.5 for reproducibility.
- Agentic coding and multi-step reasoning.
- Pipelines migrating gradually to the GPT-5.6 line.

## Notes

- Reasoning efforts none through xhigh; the max level is exclusive to the GPT-5.6 line.
- GPT-5.5 retains its $5/$30 list price while gpt-5.6-sol is temporarily $4/$20 through 2026-11-21.
- Requests above 272K input tokens bill at OpenAI long-context rates: 2× input and 1.5× output on the whole request.

## Call it

```bash
curl https://router.apitoken.sale/v1/responses \
  -H "Authorization: Bearer $APITOKEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "gpt-5.5", "input": "Reply with exactly: connected"}'
```

## FAQ

**How much does the GPT-5.5 API cost?**

Officially $5 per 1M input tokens and $30 per 1M output tokens. With the flat 50% apiToken.sale discount that is $2.50/$15. Promotional GPT-5.6 Sol is cheaper through 2026-11-21.

**GPT-5.5 or GPT-5.6 Sol?**

New projects should default to gpt-5.6-sol, which is also cheaper during its promotion. Keep 5.5 when prompts or evals are pinned to it.

**What is the model ID?**

gpt-5.5 — use it as-is on the OpenAI-compatible endpoint at https://router.apitoken.sale/v1.

---
API reference: https://apitoken.sale/md/docs · All models: https://apitoken.sale/md/models