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Abacus

GPT-5 Codex API

Abacus
About

Build advanced reasoning agents with GPT-5 Codex, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $1.25/1M input and $10.00/1M output tokens, native tool calling support. Access GPT-5 Codex 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
Not Supported
Limits
Context Window
400K

Tokens

Input Limit
272K

Tokens

Max Output
128K

Tokens

Pricing

Standard (per 1M tokens)

Input
$1.25
Output
$10.00
Frequently Asked Questions

GPT-5 Codex by Abacus costs $1.25 per 1M input tokens and $10.00 per 1M output tokens.

Model Details
ID
gpt-5-codex
Provider
Abacus
Family
gpt
Release Date
Sep 15, 2025
Knowledge Cutoff
Sep 30, 2024
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
ABACUS_API_KEY
API Base URL
https://routellm.abacus.ai/v1
Documentation