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Abacus

GPT-5.4 API

Abacus
About

Build advanced reasoning agents with GPT-5.4, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $2.50/1M input and $15.00/1M output tokens, native tool calling support. Access GPT-5.4 via the Abacus API with up to 128K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Fixed
Attachment
Supported
Limits
Context Window
1.1M

Tokens

Input Limit
922K

Tokens

Max Output
128K

Tokens

Pricing

Standard (per 1M tokens)

Input
$2.50
Output
$15.00
Frequently Asked Questions

GPT-5.4 by Abacus costs $2.50 per 1M input tokens and $15.00 per 1M output tokens.

Model Details
ID
gpt-5.4
Provider
Abacus
Family
gpt
Release Date
Mar 5, 2026
Knowledge Cutoff
Aug 31, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
ABACUS_API_KEY
API Base URL
https://routellm.abacus.ai/v1
Documentation