SpaceXAI releases Grok 4.6, claiming parity with GPT-5.6 Sol and Fable 5

SpaceXAI on Wednesday released Grok 4.6, positioning its latest frontier AI model as a direct competitor to OpenAI's GPT-5.6 Sol and Anthropic's Fable 5 — at roughly half the cost. The model is immediately available through Cursor, Grok Build, Grok Bot, and the SpaceXAI API.

Benchmark Performance

Grok 4.6 scored 61 on the Artificial Analysis Intelligence Index, a composite of nine benchmarks, tying GPT-5.6 Sol Max and trailing Anthropic's Fable 5 Max by a single point. The model leads both rivals on GDPVal-AA v2 with a score of 1753, as well as on the AA-Briefcase and Harvey LAB benchmarks. On coding evaluations including CursorBench v3.2, Grok 4.6 scored 69.9%, narrowly behind Fable 5 Max's 70.5% but ahead of GPT-5.6 Sol Max's 67.2%.9to5mac+1

SpaceXAI said the model underwent a longer supplemental training run than Grok 4.5, incorporating curated engineering data and expanded reinforcement learning across agentic tasks including coding, knowledge work, and computer-aided design. The company described the model as focused on long-running agents and "more ambitious interactive and visual work".officechai+2

Elon Musk called the release a "banger" on X.basenor

Pricing and Availability

API pricing is set at $2 per million input tokens and $6 per million output tokens, with a faster variant available at double the rate. SpaceXAI frames this as roughly half the cost of comparable frontier models from OpenAI and Anthropic. Cursor and Grok Build users receive double their included Grok 4.6 usage during the model's first week.tradingkey+2

The model is also accessible through third-party platforms including OpenRouter Cloudflare, Inc. ↗ 1.46%, Vercel, and Cloudflare.9to5mac

Market Reaction and What's Next

SpaceX ↗ 9.65% stock rose more than 6% following the announcement, trading near $142. Morgan Stanley ↗ 1.20% on Monday issued a bull case of $600 per share for SpaceX, citing the company's AI business and its potential to build a broader AI platform with Grok as the intelligence layer.coingape

SpaceXAI has signaled an aggressive release cadence. Grok 4.7, reportedly a 2.1-trillion-parameter model, is expected within weeks.youtube+1