SpaceXAI releases Grok 4.7 with a new larger base model and new safeguard stack
Confirmed
Importance: major (4 of 5)The takeaway
On 2026-09-21 SpaceXAI released Grok 4.7, its most capable model for coding and knowledge work, built on a new, larger base model than Grok 4.6 and a longer RL run weighted toward multi-hour tasks.
Status
- Claim
Confirmed
- Our reporting
- High confidence
- Importance
- Major (4 of 5)
- Last verified
- 29 September 2026
Your AI and this story
- GPT-6 Astra144 days after its cutoff
- Claude Opus 5.583 days after its cutoff
- Gemini 4 Hydrogen174 days after its cutoff
- Grok 4.7113 days after its cutoff
None of these four assistants can know about it. The closest, Claude Opus 5.5, stops 83 days before it.
Key facts
- Released 2026-09-21 in Cursor, Grok Build, the Grok API, third-party coding harnesses, routers and cloud platforms
- Price: $2 per 1M input / $6 per 1M output tokens; fast variant at 2x price for 2x output speed
- New, larger base model than Grok 4.6; longer RL run on tasks that take many hours
- CursorBench 4.0: 46.3%; DeepSWE v1.1 (high effort): 71.0%; Terminal-Bench 4.0: 37.6%; EEBench: 64.0% (xAI)
- AA Briefcase v1.1: 1,657; Harvey Legal Agent Benchmark: 19.6%; HealthBench Professional: 56.7% (xAI)
- Safety: HackerBench v0.3 - only 3.3% of risky dual-use cyber prompts allowed; LatchBio biosafety: 62.4%
- SiliconANGLE: on EEBench (chip design) it beat Fable 5.1 but trailed GPT-6 Astra
- Grok Voice Transcribe 2.0 was released the Friday before (per SiliconANGLE)
What happened
Just six weeks after Grok 4.6, SpaceXAI shipped Grok 4.7 (2026-09-21). xAI says it works longer on difficult tasks and checks its own work more carefully. It uses a new, larger base model and a longer reinforcement-learning run on a harder task mix weighted toward problems that take many hours. Price and speed are unchanged from Grok 4.6.
xAI-reported results include CursorBench 4.0 46.3%, DeepSWE v1.1 71.0% (high effort), Terminal-Bench 4.0 37.6%, EEBench 64.0%, AA Briefcase v1.1 1,657, Harvey Legal Agent Benchmark 19.6% and HealthBench Professional 56.7%. It also introduced “an entirely new safeguard stack”, with xAI claiming its strongest refusal/jailbreak resistance yet while keeping legitimate security work unblocked (HackerBench v0.3: 3.3% risky prompts allowed).
Why it matters
xAI’s rapid 4.x cadence (4.5 -> 4.6 -> 4.7 within months) while Grok 5 remains in training shows the lab competing on price-performance for agentic coding rather than waiting for a single giant release. The emphasis on safety benchmarks is also a shift for xAI, which had been criticized for weak safeguards.
Sources
4 sources from 4 sites. Numbers match the chips in the text.
4 sources: 1 primary, 3 press
Primary
- Introducing Grok 4.7 | SpaceXAIx.ai, official
Press
- SiliconANGLE - SpaceX launches Grok 4.7 with long-horizon processing, safety upgradessiliconangle.com, press
- Unite.AI - SpaceXAI releases Grok 4.7 for coding and knowledge workunite.ai, press
- TestingCatalog - SpaceXAI releases Grok 4.7testingcatalog.com, press
Changes
- Filed