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OpenAI

gpt-5.5

Model IDgpt-5.5

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Model introduction

GPT-5.5 is OpenAI's general flagship for reasoning, coding, and professional knowledge work, with a 1M context window, multimodal input, and tool workflows.

Model capabilities

Specifications come from the cited model material. Catalog tags help identify access features; use the source documentation for exact limits.

OpenAI compatibleResponses APIAnthropic compatibleGemini compatibleImage generationPrompt cacheReasoningVisionAudio

Verified specifications

Official positioning
General flagship for reasoning and professional work
Context window
1,000,000 tokens
Input modalities
Text, image, audio, video
Verified capabilities
Reasoning, coding, tools, multimodal understanding

Sources: B.AI GPT-5.5 model guide

Model pricing and access

Prices are read directly from the MoleAPI console catalog and shown by current billing group and context tier.

Your final charge follows the account group shown in the console.
Live pricing source

Pricing table

USD / 1M tokens
Standardx1defaultInput $5 · Output $30
standard

Length ≤ 272K

Input
$5/ 1M
Output
$30/ 1M
Cache read
$0.5/ 1M
Cache write
$6.25/ 1M
long_context
Input
$10/ 1M
Output
$45/ 1M
Cache read
$1/ 1M
Cache write
$6.25/ 1M
Discountx0.8discountInput $4 · Output $24
standard

Length ≤ 272K

Input
$4/ 1M
Output
$24/ 1M
Cache read
$0.4/ 1M
Cache write
$5/ 1M
long_context
Input
$8/ 1M
Output
$36/ 1M
Cache read
$0.8/ 1M
Cache write
$5/ 1M
Relayx0.3relayInput $1.5 · Output $9
standard

Length ≤ 272K

Input
$1.5/ 1M
Output
$9/ 1M
Cache read
$0.15/ 1M
Cache write
$1.875/ 1M
long_context
Input
$3/ 1M
Output
$13.5/ 1M
Cache read
$0.3/ 1M
Cache write
$1.875/ 1M
Temporary (availability may vary)x0.1tempInput $0.5 · Output $3
standard

Length ≤ 272K

Input
$0.5/ 1M
Output
$3/ 1M
Cache read
$0.05/ 1M
Cache write
$0.625/ 1M
long_context
Input
$1/ 1M
Output
$4.5/ 1M
Cache read
$0.1/ 1M
Cache write
$0.625/ 1M

Access protocols

Available billing groups: Standard, Discount, Relay, Temporary (availability may vary)

openai
POST
/v1/chat/completions
openai-response
POST
/v1/responses
anthropic
POST
/v1/messages
gemini
POST
/v1beta/models/{model}:generateContent
image-generation
POST
/v1/images/generations
openai-response-compact
POST
/v1/responses/compact
openai-alpha-search
POST
/v1/alpha/search

About gpt-5.5

This introduction is transcreated for clarity and cross-checked against the cited model material.

GPT-5.5 is OpenAI's general flagship for reasoning, coding, and professional knowledge work, with a 1M context window, multimodal input, and tool workflows.

Core strengths

  • A 1M context window supports long tasks spanning many files and documents.
  • Covers coding, research, data analysis, and tool use.
  • Can work with text, image, audio, and video information.

Limitations

  • Costs and wait times exceed lightweight models, favoring valuable work.
  • GPT-5.6 supersedes it as the latest family, so new projects should also evaluate Terra or Sol.

Selection and production evaluation

Start a gpt-5.5 evaluation by mapping its official positioning to real work: Complex coding, research, long-document analysis, data work, and professional tasks that use multimodal context. The first pass should exercise both its main strength, "A 1M context window supports long tasks spanning many files and documents.", and its known limitation, "Costs and wait times exceed lightweight models, favoring valuable work.", instead of relying on a single subjective general-chat comparison.

For access, MoleAPI currently lists openai, openai-response, anthropic, gemini, image-generation, openai-response-compact, openai-alpha-search protocols and the Standard, Discount, Relay, Temporary (availability may vary) billing groups for this OpenAI model; the default price summary is Input $5 / 1M tokens · Output $30 / 1M tokens. Pricing, protocols, and groups come from the live catalog, so production planning should still price representative requests using real context length, output size, and cache-hit assumptions.

No independent ranking is shown unless it matches this exact model ID and reasoning profile, so nearby variants are not used as a proxy. Before launch, pin the model ID, prompt, and sample set, then compare task accuracy, structured-output validity, tool-call success, and timeout rates under the same conditions.

The model material on this page was last checked on 2026-07-24. When upstream model cards, context limits, or tool support change, update the cited bilingual facts before changing the recommendation; live MoleAPI price changes remain separate and update from the catalog automatically.

Code examples

These examples use MoleAPI's Responses API endpoint and run after you replace the API key.

curl https://api.moleapi.com/v1/responses \
  -H "Authorization: Bearer $MOLEAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.5",
    "input": "Explain this problem step by step."
  }'

More related models

More OpenAI models

OpenAI

gpt-5.6-luna

$0.2 / 1M tokens / $1.2 / 1M tokens

OpenAI

gpt-5.6-sol

$5 / 1M tokens / $30 / 1M tokens

OpenAI

gpt-5.6-terra

$2 / 1M tokens / $12 / 1M tokens

Frequently asked questions

How is gpt-5.5 priced?

This page reads prices from the MoleAPI console API and updates with model prices, context tiers, and account groups.

How can I access gpt-5.5?

Protocols and endpoints come from the supported_endpoint_types field in the MoleAPI model catalog.

How do I switch an existing project to gpt-5.5?

Keep the MoleAPI API address and key, replace the model parameter with the model ID on this page, then check protocol-specific parameter differences.

Where do the gpt-5.5 model details come from?

Capabilities and limitations are checked against B.AI and the other cited pages. Pricing and available protocols come only from the MoleAPI console.