AI Index

GPT-5.4 MinivsMercury 2.5

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 Mini on OpenAI APIMercury 2.5 on Inception API
Rate appliedBase rateBase rate
Inputper 1M tokens$0.75 $0.20
Cache readper 1M tokens$0.075 $0.020
Outputper 1M tokens$4.50 $0.75
Cost per request$0.015$0.0031
Per 1,000 requests$15.00$3.10

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. A line ends at the model’s context window.

0$0.020$0.0400250K500K750K1Mprompt tokens per request8KMercury 2.5$0.0031 at 8KGPT-5.4 Mini$0.015 at 8K
  • GPT-5.4 Mini · OpenAI API
  • Mercury 2.5 · Inception API

Key differences

GPT-5.4 MiniMercury 2.5
InputMaker’s official API · global · USD
$0.75 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.20 / 1M tokens Inception: models · as of Nov 2, 2026
OutputMaker’s official API · global · USD
$4.50 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.75 / 1M tokens Inception: models · as of Nov 2, 2026
Context
400,000 GPT-5.4 mini model · as of Nov 1, 2026
260,000 Inception: models · as of Nov 2, 2026
Max output
128,000 GPT-5.4 mini model · as of Nov 1, 2026
65,536 Inception: models · as of Nov 2, 2026
Input modalities
Text, Image GPT-5.4 mini model · as of Nov 1, 2026
Text Inception: FAQ · as of Nov 2, 2026
Cache readMaker’s official API · global · USD
$0.075 / 1M tokens OpenAI API pricing · as of Nov 2, 2026
$0.020 / 1M tokens Inception: models · 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 Mini OpenAI Mercury 2.5 Inception
Overview
ReleasedMar 17, 2026 Sep 8, 2026
Open weights— —
Knowledge cutoffAug 2025 Nov 1, 2025
Specs
Context400K 260K
Max input272K Not stated
Max output128K 65.54K
Input modalitiesText, Image Text
Output modalitiesText Text
ReasoningYes Yes
Reasoning effortsnone, low, medium, high, xhigh low, medium, high
Reasoning can be offYes Not stated
Tool useYes Yes
Structured outputYes Yes
Pricing · per 1M tokens
Input price$0.75Also priced under other conditions: Batch, Flex tier, Fast tier $0.20
Output price$4.50Also priced under other conditions: Batch, Flex tier, Fast tier $0.75
Cache read price$0.075Also priced under other conditions: Batch, Flex tier, Fast tier $0.020
Blended price (3 input : 1 output)$1.6875 $0.3375
Pricing under conditions · per 1M tokens
Batch input price$0.375Batch Not offered
Batch output price$2.25Batch Not offered
Flex tier input price$0.375Flex tier Not offered
Flex tier output price$2.25Flex tier Not offered
Cited scores
Epoch Capabilities Index149.3 —
LMArena Text1,447 high effort—
LMArena Text · Coding1,495 high effort—
LMArena Vision1,245 high effort—
LMArena Text · Chinese1,474 high effort—
Epoch AI · GPQA Diamond86.9% xhigh effort—
Epoch AI · FrontierMath Tiers 1–351.2% xhigh 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