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gpt-5.5 API

gpt-5.5

OpenAI gpt-5.5 for chat and coding; Flatkey routes this model through /v1/chat/completions. $4/$24 per 1M tokens 1,048,576-token context window.

Chat and codingLong contextTool workflows
Input /M
Reference price: $5
$4-20%
Cache /M
Reference price: $0.5
$0.4-20%
Output /M
Reference price: $30
$24-20%
Provider
OpenAI

gpt-5.5 API performance

gpt-5.5 API reliability and uptime

Live Flatkey request telemetry for gpt-5.5 appears here when enough production traffic is available.

Avg. provider uptime
92.5%
last 30 days
Latency
2.37s
last 30 days
Requests
217K
30-day window
Successful inference trend
#6 · 1.44T

gpt-5.5 API activity

gpt-5.5 API usage and request activity

Track request volume and successful inference activity for gpt-5.5 over the latest reporting window.

Requests
217K
30-day window
Latency
2.37s
last 30 days
Uptime
92.5%
last 30 days
Successful inference trendActivity

gpt-5.5 pricing

gpt-5.5 API pricing and billing

Prices below are calculated from Flatkey pricing data for this model and the visible groups currently returned by our pricing API.

Flatkey price

Input /M

Live catalog model
$4
Input /M
$4$5
Cache /M
$0.4$0.5
Output /M
$24$30
View API
Shared balance

Add credits

Add credits

Use the same Flatkey balance and API key across image, video, audio, and text models.

$10Open wallet$20Open wallet$50Open wallet
Model catalog
Model Type
Text
API
/v1/chat/completions
Billing basis
1M tokens

gpt-5.5 chat and coding: core capabilities

OpenAI's gpt-5.5 route supports text · image · file. Catalog categories: Programming, Marketing, SEO.

gpt-5.5 chat and coding API

Call gpt-5.5 through /v1/chat/completions for chat, coding or agent workflows supported by the model's listed modalities.

gpt-5.5 long-context work

gpt-5.5 is listed with 1,048,576-token; use that catalog value as an integration planning reference and validate limits for your account.

gpt-5.5 tool and agent workflows

Keep tool calls, structured output and streaming behavior aligned with the endpoint contract instead of assuming every provider feature is interchangeable.

gpt-5.5 production routing

Use one Flatkey key for gpt-5.5, usage controls and model routing while retaining the exact model id in your SDK configuration.

Compare

gpt-5.5 API comparison: capabilities and access

Compare the catalog facts for gpt-5.5 with the previous-generation baseline before changing your integration.

CapabilityPrevious generationgpt-5.5
ProviderNot verified in this catalog snapshotOpenAI
ModalitiesNot verified in this catalog snapshottext · image · file
ContextNot verified in this catalog snapshot1,048,576-token
EndpointNot verified in this catalog snapshot/v1/chat/completions
BillingNot verified in this catalog snapshot$4/$24 per 1M tokens

Why Flatkey

Why use Flatkey for gpt-5.5?

OpenAI-compatible migration path

Chat Completions-style payloads reduce switching friction from existing model stacks.

Production routing

Keep usage, keys, quotas, and model routing in one Flatkey account.

Unified API access

Use one account and API key across image, video, audio, and language models.

Routing across upstream channels

Requests are spread across the channels serving this model, with 30-day uptime published above.

API Gateway

Supported endpoint coverage in our pricing API.

Call this model through the same OpenAI-compatible router and API key as the rest of the Flatkey catalog.
Use your existing SDK and set its base URL to the Flatkey router origin.
Keep prompts and request files in your terminal workflow with the Flatkey CLI.
Use the same key with your coding agent and route model jobs from a script.
curl https://router.flatkey.ai/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-..." \
  -d '{
  "model": "gpt-5.5",
  "messages": [
    {
      "role": "user",
      "content": "You are a senior backend engineer. In 3 sentences, explain why developers should use an LLM gateway instead of calling each official API directly."
    }
  ]
}'
Docs

FAQ

gpt-5.5 API
pricing, features, and usage FAQs

Answers about gpt-5.5 pricing, capabilities, endpoint access and catalog limits.

What is gpt-5.5 used for?
gpt-5.5 is listed by OpenAI for chat and coding; the catalog lists these modalities: text · image · file.
How is gpt-5.5 priced?
Use the pricing section above for current Flatkey prices from our pricing API.
Which API endpoint calls gpt-5.5?
Flatkey routes this model through /v1/chat/completions. Set the model field to gpt-5.5 and follow the fields supported by that endpoint.
What context or input limits does gpt-5.5 have?
gpt-5.5 is listed with 1,048,576-token. Other limits depend on the route and current account availability, so verify them before production use.