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xAI models.
Access 8 models from xAI through the Impossibl API, including Grok 4.20 (non-reasoning), Grok 4.20 (reasoning), and Grok 4.20 (multi-agent). Compare API pricing, context windows, and capabilities.
filter by model type, supported inputs, and context window. select two or three models to compare specifications and estimate the same workload.
- Grok 4.20 (multi-agent)
xai/grok-4.20-multi-agent-0309
Grok 4.20 (multi-agent) is a text generation model from xAI, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $1.25 per million input tokens. The advertised output rate is $2.50 per million output tokens. Additional pricing brackets apply when the input exceeds a published context threshold.
xAIText generationimage input
- context
- 1mtokens
- input price
- $1.25/1m tokens
- output price
- $2.50/1m tokens
- Grok 4.20 (non-reasoning)
xai/grok-4.20-0309-non-reasoning
Grok 4.20 (non-reasoning) is a text generation model from xAI, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $1.25 per million input tokens. The advertised output rate is $2.50 per million output tokens. Additional pricing brackets apply when the input exceeds a published context threshold.
xAIText generationimage input
- context
- 1mtokens
- input price
- $1.25/1m tokens
- output price
- $2.50/1m tokens
- Grok 4.20 (reasoning)
xai/grok-4.20-0309-reasoning
Grok 4.20 (reasoning) is a text generation model from xAI, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $1.25 per million input tokens. The advertised output rate is $2.50 per million output tokens. Additional pricing brackets apply when the input exceeds a published context threshold.
xAIText generationimage input
- context
- 1mtokens
- input price
- $1.25/1m tokens
- output price
- $2.50/1m tokens
- Grok 4.3
xai/grok-4.3
Grok 4.3 is a text generation model from xAI, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $1.25 per million input tokens. The advertised output rate is $2.50 per million output tokens. Additional pricing brackets apply when the input exceeds a published context threshold.
xAIText generationimage input
- context
- 1mtokens
- input price
- $1.25/1m tokens
- output price
- $2.50/1m tokens
- Grok 4.5
xai/grok-4.5
Grok 4.5 is a text generation model from xAI, available through the Impossibl API. Its published context window is 500,000 tokens. The advertised input rate is $2.00 per million input tokens. The advertised output rate is $6.00 per million output tokens. Additional pricing brackets apply when the input exceeds a published context threshold.
xAIText generationimage input
- context
- 500ktokens
- input price
- $2.00/1m tokens
- output price
- $6.00/1m tokens
- Grok 4.6
xai/grok-4.6
Grok 4.6 is a text generation model from xAI, available through the Impossibl API. Its published context window is 500,000 tokens. The advertised input rate is $2.00 per million input tokens. The advertised output rate is $6.00 per million output tokens. Additional pricing brackets apply when the input exceeds a published context threshold.
xAIText generationimage input
- context
- 500ktokens
- input price
- $2.00/1m tokens
- output price
- $6.00/1m tokens
- Grok Build 0.1
xai/grok-build-0.1
Grok Build 0.1 is a text generation model from xAI, available through the Impossibl API. Its published context window is 256,000 tokens. The advertised input rate is $1.00 per million input tokens. The advertised output rate is $2.00 per million output tokens. Additional pricing brackets apply when the input exceeds a published context threshold.
xAIText generationimage input
- context
- 256ktokens
- input price
- $1.00/1m tokens
- output price
- $2.00/1m tokens
- Grok Voice TTS 1.0
xai/grok-voice-tts-1.0
Grok Voice TTS 1.0 is a text-to-speech model from xAI, available through the Impossibl API. The advertised input rate is $15.00 per million input characters.
xAIText to speech
- context
- unknown
- input price
- $15.00/1m chars
- output price
- unknown
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 xAI models are available through Impossibl?
The directory lists 8 models from xAI available through the Impossibl API, including Grok 4.20 (non-reasoning), Grok 4.20 (reasoning), and Grok 4.20 (multi-agent). Open each model page for its API identifier, capabilities, and current pricing.
How much do xAI 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. 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 context windows do xAI 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 1 model.
What inputs and capabilities do xAI models support?
Available model types include text generation and text to speech. Published input support includes image and text; support varies by model. Tool-calling support is unspecified for 8 models.
How do I use xAI models through an API?
Use the exact model identifier from the model page with the Impossibl API. For example, select xai/grok-4.20-0309-non-reasoning 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.