xAI

Grok models with an OpenAI-shaped API and live X data access

x.ai docs.x.ai

Overall in llm apis

7of 18 · score 64.5

Data coverage

85%

23 of 27 fields sourced

Best for

•Products that want real-time X/Twitter context in the model
•Cheap evaluation of a frontier alternative with a one-line base-URL change
•Consumer applications where governance requirements are light

Strong on

+Max output Unlimited 1/10
+Trains on your data Partial 2/18

Weak on

−API since 2024 16/18
Better: OpenAI: 2020
−Open weights Partial 12/18
Better: Meta Llama: Yes
−Batch discount 20% 11/14
Better: Anthropic: 50%

vs Fireworks AI

•Ahead on Trains on your data: Partial vs No
•Ahead on Effort control: Partial vs No
•Behind on Batch discount: 20% vs 50%
•Behind on Zero retention: Partial vs Yes

How xAI scores among 18 llm apis23 of 27 fields known

Capability7

Flagship model

Grok 4.5 (grok-4.5)

docs.x.ai · 2026-07-30

Context window

500,000 tokens

9/14

Leader: Anthropic · 1,000,000 tokens

docs.x.ai · 2026-07-30

Max output1st

Unlimited

1/10

docs.x.ai · 2026-11-07

Image input1st

Yes

1/18

docs.x.ai · 2026-07-30

Audio in/out1st

Partial

1/18

docs.x.ai · 2026-07-30

Open weights

Partial

12/18

Leader: Meta Llama · Yes

· 2026-01-15

OpenAI-compat API1st

Yes

1/18

docs.x.ai · 2026-07-30

Performance2

TTFT p50

—

Output tok/s

—

Pricing4

$/M input

$2/M tok

7/13

Leader: Groq · $0.05/M tok

docs.x.ai · 2026-11-06

$/M output

$6/M tok

7/13

Leader: Fireworks AI · $0.05/M tok

docs.x.ai · 2026-11-06

$/M cache read

$0.3/M tok

7/12

Leader: DeepSeek · $0.0028/M tok

docs.x.ai · 2026-07-30

Batch discount

20%

11/14

Leader: Anthropic · 50%

docs.x.ai · 2026-11-07

Agentic6

Tool use1st

Yes

1/18

docs.x.ai · 2026-07-30

Schema output1st

Yes

1/18

· 2026-01-15

Effort control

Partial

5/18

Leader: Anthropic · Yes

· 2026-01-15

Computer use

5/18

Leader: Anthropic · Yes

· 2026-01-15

MCP support

6/18

Leader: Anthropic · Yes

· 2026-01-15

Cache TTL

—

Governance & continuity6

Continuity policy

Dated model IDs exist and are the recommended way to address a model, but xAI publishes no formal deprecation policy or notice window, and model naming has changed repeatedly between generations. The shortest track record of any first-party lab here.

· 2026-01-15

Notice period

—

Pinnable versions1st

Yes

1/18

· 2026-01-15

Zero retention

Partial

7/18

Leader: Amazon Bedrock · Yes

docs.x.ai · 2026-11-07