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xAI

xAI API and models: 10 models on Impossibl, including Grok 4.7, Grok 4.6, and Grok 4.5. Compare pricing per million tokens, context windows, and capabilities between different xAI models.

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models

modalities · in → out

latest release

Grok 4.7Sep 21, 2026

xAI

model

Grok 4.7
xai/grok-4.7
Grok 4.7 is SpaceXAI's flagship model for coding, agentic tool calling, and knowledge work, accepting text and image input and returning text.
xAIText generationimage input
context
500ktokens
input price
$2.00/1m tokens
output price
$6.00/1m tokens
released
sep 21, 2026
Grok 4.6
xai/grok-4.6
Grok 4.6 is xAI's frontier flagship Grok model, positioned for coding, agentic tasks, knowledge work, and STEM.
xAIText generationimage input
context
500ktokens
input price
$2.00/1m tokens
output price
$6.00/1m tokens
released
aug 12, 2026
Grok 4.5
xai/grok-4.5
Grok 4.5 is xAI's Grok 4-generation model for coding, agentic tasks, and knowledge work, sitting below Grok 4.6 in the family.
xAIText generationimage input
context
500ktokens
input price
$2.00/1m tokens
output price
$6.00/1m tokens
released
jul 8, 2026
Grok Build 0.1
xai/grok-build-0.1
Grok Build 0.1 is xAI's fast coding model, trained specifically for agentic software engineering workflows and released as an early-access preview.
xAIText generationimage input
context
256ktokens
input price
$1.00/1m tokens
output price
$2.00/1m tokens
released
may 19, 2026
Grok 4.20 (multi-agent)
xai/grok-4.20-multi-agent-0309
Grok 4.20 (multi-agent) is the multi-agent beta snapshot of xAI's Grok 4.20, aimed at deep research tasks.
xAIText generationimage input
context
1mtokens
input price
$1.25/1m tokens
output price
$2.50/1m tokens
released
mar 10, 2026
Grok 4.20 (non-reasoning)
xai/grok-4.20-0309-non-reasoning
Grok 4.20 (non-reasoning) is the non-reasoning snapshot of xAI's Grok 4.20, built for fast, precise responses with agentic tool calling and strict prompt adherence.
xAIText generationimage input
context
1mtokens
input price
$1.25/1m tokens
output price
$2.50/1m tokens
released
mar 10, 2026
Grok 4.20 (reasoning)
xai/grok-4.20-0309-reasoning
Grok 4.20 (reasoning) is the reasoning-enabled snapshot of xAI's Grok 4.20, a general-purpose model aimed at fast agentic tool calling with strict prompt adherence.
xAIText generationimage input
context
1mtokens
input price
$1.25/1m tokens
output price
$2.50/1m tokens
released
mar 10, 2026
Grok 4.3
xai/grok-4.3
Grok 4.3 is xAI's fast, reliable Grok model built for agentic workflows and instruction-following tasks.
xAIText generationimage input
context
1mtokens
input price
$1.25/1m tokens
output price
$2.50/1m tokens
released
—
Grok Speech to Text 1.0
xai/grok-stt-1.0
Grok STT is xAI's speech recognition model for transcribing recorded audio.
xAISpeech to textaudio input
context
unknown
input price
$0.00166667/minute
output price
unknown
released
—
Grok Voice TTS 1.0
xai/grok-voice-tts-1.0
Grok Voice TTS 1.0 is xAI's text-to-speech model, turning text into natural, expressive spoken audio for voice agents, accessibility tools, podcasts, and interactive audio.
xAIText to speech
context
unknown
input price
$15.00/1m chars
output price
unknown
released
—

compare xAI models

compare models with the same model type and billing unit. each comparison includes published api prices, context limits, and capabilities.

frequently asked questions

Which Grok models are available through Impossibl?

The directory lists 10 models from xAI available through the Impossibl API, including Grok 4.7, Grok 4.6, and Grok 4.5. Open each model page for its API identifier, capabilities, and current pricing.

How much do Grok models cost?

xAI model prices vary by model and usage. All rates below are published base API rates in USD. For token-priced models, published input rates start at $1.00 per million input tokens. Published output rates start at $2.00 per million output tokens. Input and output minima may refer to different models. For character-priced models, published input rates start at $15.00 per million input characters. For audio-duration models, published input rates start at $0.00166667 per minute of audio. Long-context tiers can change prices for the whole request; check each model's thresholds and rates. Individual model pages include published cache prices and billing units. Applicable fees and workspace-specific pricing can affect the amount paid.

What is the cheapest Grok model?

By published input rate, the cheapest Grok text generation model on Impossibl is Grok Build 0.1 (xai/grok-build-0.1) at $1.00 per million input tokens and $2.00 per million output tokens. Cheapest by input rate is not always cheapest for a workload; output-heavy or cached requests can favor another model.

Does Impossibl add a markup to xAI pricing?

No. Usage is charged at the provider's list price with 0% usage markup. Prepaid credit purchases include a 5% platform fee, and there is no subscription. The rates on this page are xAI's published base rates, and usage comes off your balance when the request finishes.

What context windows do Grok models support?

Among xAI models with a published limit on Impossibl, the largest context window is 1,000,000 tokens, listed for Grok 4.20 (non-reasoning), Grok 4.20 (reasoning), and Grok 4.20 (multi-agent). Context limits vary by model and are separate from maximum output limits. Context windows are unpublished for 2 models.

What inputs and capabilities do Grok models support?

Available model types include speech to text, text generation, and text to speech. Published input support includes audio, image, and text; support varies by model. Tool-calling support is unspecified for 10 models.

How do I use Grok models through an API?

Use the exact model identifier from the model page with the Impossibl API. For example, select xai/grok-4.7 with /v1/chat/completions. Endpoint compatibility depends on the selected model. The API quickstart explains how to create an API key and send a request.

xAI