GPT 5.5
Balanced frontier model for production assistants, coding, and tool use.
Overview
Recommended use cases and a precise technical profile, generated from the same reviewed model record used throughout this page.
| Model ID | gpt-5.5 | Provider | OpenAI |
| Protocol | OPENAI compatible | DIT availability | 2 active routes |
| Input | Text, Image, Pdf | Output | Text |
| Context window | 1,050,000 tokens | Maximum output | 128,000 tokens |
| Released | Apr 23, 2026 | Knowledge cutoff | Dec 1, 2025 |
| Endpoint | Path | Status |
|---|---|---|
| Chat Completions | /v1/chat/completions | Supported |
Providers
Compare DIT market routing with the official upstream reference across price, speed, and availability. Supplier identities remain private.
| Provider | Input /M | Output /M | Cache read /M | Latency | Throughput | Uptime |
|---|---|---|---|---|---|---|
DIT Market 40% off Aggregated supply · 2 active routes | — | 6635 msP50 TTFT | 15.8 tpsP50 output | 39.55%30-day success | ||
OpenAI official Reference Direct upstream · reviewed list price | $5 | $30 | — | —Awaiting data | —Awaiting data | OperationalChecked Sep 29, 2026 |
Prices are USD per 1M tokens. DIT performance and uptime appear only after 50 eligible requests; supplier identities and customer traffic remain private.
Pricing
Compare DIT market rates directly with reviewed official prices so savings remain visible and auditable.
| Usage | Official | DIT market | Saving | Billing basis |
|---|---|---|---|---|
| Input tokens | $5 | $2 | ~40% | Per 1M tokens |
| Output tokens | $30 | $18 | ~40% | Per 1M tokens |
| Cached input | — | — | — | Per 1M cached tokens |
Performance
Latency, throughput, activity, and request success use privacy-safe DIT runtime aggregates only when the eligibility threshold is met.
| Metric | P50 | P95 | Reading |
|---|---|---|---|
| Time to first byte | 6635 ms | 41432 ms | Lower is better |
| End-to-end latency | 11661 ms | — | Lower is better |
| Output throughput | 15.8 tps | — | Higher is better |
Uptime
A concise service-health view with scope and source stated next to the number.
Quick Start
A copy-ready request for the compatible DIT endpoint using this model's reviewed identifier.
curl https://api.dit.ai/v1/chat/completions \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-5.5",
"messages": [{"role":"user","content":"Explain dynamic model routing."}]
}'Sources
Field-level provenance keeps pricing, limits, capabilities, and benchmarks independently reviewable.
| Source | Type | Covers | Checked |
|---|---|---|---|
| OpenAI model documentation ↗ | Official | Context, Modalities, Capabilities | Oct 16, 2026 |
| models.dev catalog ↗ | models.dev | Context, Modalities, Pricing | Oct 16, 2026 |
| DIT live model catalog ↗ | DIT catalog | DIT availability, Pricing | Oct 16, 2026 |
Official sources take priority. Third-party metadata is retained only when its field and review date are shown.
Models like GPT 5.5
Reviewed models ranked by capability overlap, protocol compatibility, and context similarity.
Frequently asked questions
Answers use the same reviewed facts and pricing fields presented in the tables above.
What is GPT 5.5?+
Balanced frontier model for production assistants, coding, and tool use.
How much does GPT 5.5 cost?+
The reviewed official rate is $5 per 1M input tokens and $30 per 1M output tokens. DIT pricing is shown only when a live DIT route exists.
What is the context length of GPT 5.5?+
GPT 5.5 supports a reviewed context window of 1,050,000 tokens and up to 128,000 output tokens.
What capabilities does GPT 5.5 support?+
Reviewed capabilities include Reasoning, Tool calling, Structured outputs. Consult the linked official documentation for endpoint-specific limits.
What inputs and outputs does GPT 5.5 support?+
Reviewed input modalities: Text, Image, Pdf. Reviewed output modalities: Text.
Which API endpoints and reasoning levels does GPT 5.5 support?+
GPT 5.5 is documented for Chat Completions.
Is GPT 5.5 available on DIT?+
GPT 5.5 currently has 2 active routes. DIT selects eligible supply by price and health, with automatic failover when another route is available.
When was GPT 5.5 released?+
GPT 5.5 was released on Apr 23, 2026. Its reviewed knowledge cutoff is Dec 1, 2025.