AI Index

GPT-5.4vsGPT-5.5

Both language models, compared at each maker’s own API list prices. Every figure links to its source.

Compare at your usage

Every model priced for the same request
Prompt per request
Cache hits
Batch
Service tier

8,000 tokens in, 2,000 out

GPT-5.4 on OpenAI APIGPT-5.5 on OpenAI API
Rate appliedBase rateBase rate
Inputper 1M tokens$2.50 $5.00
Cache readper 1M tokens$0.25 $0.50
Outputper 1M tokens$15.00 $30.00
Cost per request$0.050$0.10
Per 1,000 requests$50.00$100.00

Every model is priced for the same request at its maker’s own list prices (each with its source and date), so bold marks the cheapest. A model that can’t serve the request is named, not ranked; a condition its seller doesn’t price says which rate was used.

Cost per request as prompts grow

2K tokens out, list price on each maker’s API. GPT-5.4 charges $5.00 / $22.50 above 272K tokens. GPT-5.5 charges $10.00 / $45.00 above 272K tokens.

0$1.00$2.00$3.000250K500K750K1Mprompt tokens per request272K8KGPT-5.5$0.10 at 8KGPT-5.4$0.050 at 8K
  • GPT-5.4 · OpenAI API
  • GPT-5.5 · OpenAI API

Where each stands among all scored models

Each line runs from the lowest to the highest score on the board; the tick is the median.

Epoch Capabilities Index#25 vs #17 of 118GPT-5.5: 160GPT-5.4: 157.8LMArena Text#31 vs #21 of 163GPT-5.5: 1,482GPT-5.4: 1,475LMArena Text · Coding#28 vs #33 of 163GPT-5.5: 1,519GPT-5.4: 1,520LMArena Vision#13 vs #15 of 89GPT-5.5: 1,297GPT-5.4: 1,303
  • GPT-5.4
  • GPT-5.5

Key differences

GPT-5.4GPT-5.5
InputMaker’s official API · global · USD
$2.50 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$5.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
OutputMaker’s official API · global · USD
$15.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$30.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
Knowledge cutoff
Aug 2025 GPT-5.4 model · as of Nov 1, 2026
Dec 2025 GPT-5.5 · as of Nov 2, 2026
Cache readMaker’s official API · global · USD
$0.25 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.50 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
InputMaker’s official API · global · USD · Prompts over 272K tokens
$5.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$10.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
OutputMaker’s official API · global · USD · Prompts over 272K tokens
$22.50 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$45.00 / 1M tokens OpenAI API pricing · as of Nov 2, 2026

These differences use verified vendor specifications or each maker’s official API on the same region, currency, meter and billing conditions. Different conditions remain side by side in the full table; they do not establish which model is cheaper. Declared features describe support, not measured quality or a recommendation. Missing evidence does not mean a feature is unsupported.

Full comparison

GPT-5.4 OpenAI GPT-5.5 OpenAI
Overview
ReleasedMar 5, 2026 Apr 24, 2026
Open weights— —
Knowledge cutoffAug 2025 Dec 2025
Specs
Context1.05M 1.05M
Max input922K 922K
Max output128K 128K
Input modalitiesText, Image Text, Image
Output modalitiesText Text
ReasoningYes Yes
Reasoning effortsnone, low, medium, high, xhigh none, low, medium, high, xhigh
Reasoning can be offYes Yes
Tool useYes Yes
Structured outputYes Yes
Pricing · per 1M tokens
Input price$2.50Also priced under other conditions: Prompts over 272K tokens, Batch, Flex tier, Fast tier $5.00Also priced under other conditions: Prompts over 272K tokens, Batch, Flex tier, Fast tier
Output price$15.00Also priced under other conditions: Prompts over 272K tokens, Batch, Flex tier, Fast tier $30.00Also priced under other conditions: Prompts over 272K tokens, Batch, Flex tier, Fast tier
Cache read price$0.25Also priced under other conditions: Prompts over 272K tokens, Batch, Flex tier, Fast tier $0.50Also priced under other conditions: Prompts over 272K tokens, Batch, Flex tier, Fast tier
Blended price (3 input : 1 output)$5.625 $11.25
Pricing under conditions · per 1M tokens
Input price, long prompts$5.00Prompts over 272K tokens $10.00Prompts over 272K tokens
Output price, long prompts$22.50Prompts over 272K tokens $45.00Prompts over 272K tokens
Batch input price$1.25Batch $2.50Batch
Batch output price$7.50Batch $15.00Batch
Flex tier input price$1.25Flex tier $2.50Flex tier
Flex tier output price$7.50Flex tier $15.00Flex tier
Cited scores
Epoch Capabilities Index157.8 160
LMArena Text1,475 high effort1,482 high effort
LMArena Text · Coding1,520 high effort1,519 high effort
LMArena Vision1,303 high effort1,297
LMArena Text · Chinese1,506 high effort1,526
Epoch AI · GPQA Diamond93.3% xhigh effort90.7% low effort
Epoch AI · FrontierMath Tiers 1–378.6% xhigh effort85.3% xhigh effort
Epoch AI · SWE-bench Verified76.9% high effort—

Headline prices may come from different channels, regions or tiers. Check each source before choosing a model; missing facts stay blank.

Model details and sources

Cited scores