Grok 4
xAI
Timeline
- · API availability · evidence link
Related signals: Grok 4.7
- · Evidence links · xAI · official articles
- · Catalogue listing · GitHub · xai-org/grok-build · code
Excerpt
r is the atomic configurable unit because a model is only guaranteed to work with a compatible harness (cursor vs grok-build). #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] pub struct GoalRoleModel { /// Model id, e.g. "grok-4". It resolves against available models at spawn time; unknown or unauthorized fails open to the current model. pub model: String, /// Harness `agent_type` (e.g. "cursor", "grok-build-plan") whose `AgentDefinition` decides the role subagent's harness flavor. /// The flavor (system prompt and cursor-vs-grok-build toolset) applies regardless of the session or parent agent. /// It is resolved by name (project/plugin/builtin lookup, then re-flavored by the subagent toolset resolver). /// The main session's env/ACP/strict-harness precedence chain plays no part. /// It is not a subagent type: the role always spawns
This code reference does not establish a working model identifier.
- · Evidence links · xAI · release notes
Excerpt
You can now use Grok 4 via our API or on https://grok.com
Signals 1
Specifications
Grok 4 is a model from xAI, released on 9 Jul 2025.
Questions
When was Grok 4 released?
On 9 Jul 2025.