OpenAI

GPT-5.5

OpenAI's frontier model for complex professional work and agents, with a 1.05M-token context window and tiered pricing above 272K input tokens.

ActiveReleased April 24, 2026Knowledge cutoff December 1, 2025Available from 2 providers
Tool callingCan invoke external tools and APIs (function calling) mid-response.Structured outputCan return JSON or schema-constrained responses instead of free text.ReasoningUses extended thinking / chain-of-thought for harder multi-step problems.Effort controlLets you dial thinking depth (low / medium / high) to trade cost for quality.Fine-tuningSupports training a custom variant on your own data.

Source: OpenAI models, OpenAI pricing

Price per 1M tokens
$5 in / $30 out
Context window1,050,000
Max output128,000
Cache read$0.5 / M
Batch discount-50%
ModalitiesText, Image → Text
Priced across2 providers

Pricing

Every billing leg from the live catalog, in USD per 1M tokens.

Billing legStandardLong contextBatch
Input$5 / M$10 / M$2.5 / M
Output$30 / M$45 / M$15 / M
Cache read$0.5 / M$1 / M$0.25 / M

Long-context rates apply above 272,000 input tokens.

Cost calculator

Billing-grade math over the rate card above, including the thinking tokens most estimates miss.

Hidden reasoning tokens bill as output. 1.0x = thinking off. Medium-effort reasoning typically lands near 3x; heavy reasoning runs 6x to 8x. Set it to match your workload.

Estimated monthly cost
$2.8K
at current list prices
Fresh input$1.0K
Cached input$0.00
Output incl. thinking$1.8K
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Compare providers

The same model, priced across every platform that serves it. Lowest combined in/out rate is flagged.

PlatformInput / MOutput / MCache read / MBatchAccess
OpenAILowest
$5$30$0.5✓First-party API
Cursor
$5$30$0.5—Direct

Price history

Has this model gotten cheaper or more expensive?

EffectiveInput / OutputStatus
April 24, 2026 – July 10, 2026$5 / $30past
July 10, 2026$5 / $30current

More from OpenAI

Other models from the same provider.

GPT-5.6 Sol
openai/gpt-5.6-sol
$5 / $30 in / out per 1M
GPT-5.6 Terra
openai/gpt-5.6-terra
$2.5 / $15 in / out per 1M
GPT-5.6 Luna
openai/gpt-5.6-luna
$1 / $6 in / out per 1M
GPT-5.5 Pro
openai/gpt-5.5-pro
$30 / $180 in / out per 1M
GPT-5.4
openai/gpt-5.4
$2.5 / $15 in / out per 1M
GPT-5.4 mini
openai/gpt-5.4-mini
$0.75 / $4.5 in / out per 1M

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Rates are generated from SuperPenguin's live pricing catalog.