Grok Composer 2.5 Fast
Grok Composer 2.5 Fast is xAI's high-speed model for agentic coding, built for multi-step code edits, tool calling, and terminal operations at low latency and low cost. A fit for coding agents, IDE assistants, and high-throughput automated development. Access it on Velokey at a lower price — one API key, pay as you go, below official pricing.
Use cases
Coding agents · IDE and code assistants
Input
Text
Output
Text
Billing
Per token
Start a conversation
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Sign up to get $0.5 in free credits — about 20 free images
Pricing details
Transparent usage-based pricing with no hidden fees.
Detailed Pricing
Usage-based pricing breakdown
| Spec | Price | Official | Savings |
|---|---|---|---|
| Input/1M tokens | 2.4 Credits≈$2.4 | 3 Credits | -20% |
| Output/1M tokens | 12 Credits≈$12 | 15 Credits | -20% |
| Cache Read/1M tokens | 0.4 Credits≈$0.4 | 0.5 Credits | -20% |
Billing Rules
- Output price varies by model, resolution, quality, duration, or token usage.
- Uploaded reference files may be charged separately when supported.
- Add-on capabilities such as web search or image search may be billed per request.
- Token-based models are billed by input and output tokens.
- If the primary route is unavailable, Velokey may automatically switch to a stable fallback route when possible.
- Usage is pay-as-you-go with transparent credit deduction.
* Final cost depends on the generated result.
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Affordable Grok Composer 2.5 Fast API
Access xAI's high-speed agentic coding model, Grok Composer 2.5 Fast, at a lower price on Velokey — OpenAI-compatible, one API key, pay as you go, below official pricing.
Meet Grok Composer 2.5 Fast and its API integration
Grok Composer 2.5 Fast is xAI's model optimized for agentic coding, strong at multi-file code edits, tool calling, and terminal operations, keeping latency and cost low. On Velokey you can access the Grok Composer 2.5 Fast API at a lower price — one API key, pay as you go, below official pricing, no forced subscription — with credits, usage, and multi-model routing all managed in one console.
Fast agentic coding
Optimized for multi-step, multi-file code edits, keeping long-running coding agents on track. Compared with general-purpose models, it's faster and cheaper at implementing requirements, editing across files, and iterating — the headline capability of this generation.
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Tool calling and terminal ops
Native function calling and tool use — run terminal commands, call external APIs, and orchestrate retrieval, build, and test steps into multi-step development flows to cut round trips.
View docs →
Low latency, low cost, high throughput
Optimized for high-frequency calls with low latency and low unit price — a fit for scaling coding agents and automation without blowing the budget, the value pick for high-frequency development.
View docs →
OpenAI-compatible, one key many models
A unified interface compatible with the OpenAI calling convention; one API key reaches Grok Composer 2.5 Fast and other vendors' models, turning task routing and cross-model fallback into configuration rather than rewrites.
View docs →
How to deploy the Grok Composer 2.5 Fast API on Velokey
A few steps to start calling.
Register and get an API key
Create an API key in the Velokey console; one key authenticates every request sent to Grok Composer 2.5 Fast.
Set the model
Set model to grok-composer-2.5-fast and submit messages and tools (function calling) as needed.
Call and integrate
Send requests through Velokey's unified /v1/chat/completions endpoint, compatible with the OpenAI calling convention, with usage and credits managed in one console.
Grok Composer 2.5 Fast real-world use cases
From coding agents to high-throughput dev pipelines, a fit for many high-frequency scenarios.
Coding agents
Long-horizon automated coding: implement requirements, edit across files, run tests, and iterate.
IDE and code assistants
Low-latency completion, refactoring, and explanation for editors — fast at controllable cost.
Repo-scale tasks
Cross-repo bulk edits, migrations, and checks, scaled with tool calling and high throughput.
Terminal and automation
Run terminal commands and call tools to wire build, test, and deploy steps into agents.
High-throughput batch
Bulk code generation and checks — a low unit price makes running at scale worthwhile.
Code review and analysis
Fast review, explanation, and issue localization over diffs, PRs, and codebases.
Why choose Velokey for Grok Composer 2.5 Fast
below official pricing
Call Grok Composer 2.5 Fast at a lower price on Velokey — pay as you go, no forced subscription, lower upfront cost.
One key, many models
A single API key reaches it and other vendors' models, turning task routing and cross-model fallback into configuration rather than rewrites.
Unified OpenAI-compatible access
Compatible with the OpenAI calling convention; switching models is a single model-field change, keeping integration cost minimal.
Stability and high availability
Automatic failover and stable fallback routes maintain availability when the primary route is down, keeping production steady.
API Reference
Complete API call examples and parameter descriptions
Endpoint
https://api.velokey.ai/v1/chat/completionsAuthentication
Bearer YOUR_API_KEYRequest Example
curl https://api.velokey.ai/v1/chat/completions \
-X POST \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "grok-composer-2.5-fast",
"messages": [{"role": "user", "content": "Hello!"}],
"temperature": 0.7
}'Response Example
{
"id": "req_abc123",
"model": "grok-composer-2.5-fast",
"created": 1234567890,
"data": { ... }
}Grok Composer 2.5 Fast API FAQ
What is the Grok Composer 2.5 Fast API?
Grok Composer 2.5 Fast is xAI's high-speed model optimized for agentic coding, strong at multi-step code edits, tool calling, and terminal operations. On Velokey you call it through unified OpenAI-compatible access, with model set to grok-composer-2.5-fast.
What is Grok Composer 2.5 Fast good for?
It fits coding agents, IDE and code assistants, and bulk code generation and migration. It's optimized for multi-file edits, tool calling, and high throughput — fast and low-cost.
Does Grok Composer 2.5 Fast support function calling / tools?
Yes. It supports function calling (tools) — run terminal commands and call external APIs to wire retrieval, build, and test steps into multi-step agentic coding flows.
How does it compare with a stronger reasoning model?
Composer 2.5 Fast is built for speed and cost and fits most coding and automation tasks; for the hardest long-horizon reasoning, switch to a stronger model on Velokey per task — one key covers both.
How is it billed on Velokey?
The pricing section on this page shows current Velokey prices, billed by input and output tokens (about $2.4 input / $12 output per 1M tokens, official $3/$15). Credits are managed from one Velokey account.
Start building with Grok Composer 2.5 Fast today
Use one API key to access low-cost, stable AI models through Velokey.