Anthropic vs 
SpaceXAI
Verdict
- Anthropic's flagship leads: Claude Fable 5.1 at 71.9 vs Grok 4.6 at 66.0.
- SpaceXAI has the better model in 2 of 4 price bands.
- SpaceXAI's fastest ranked model (Grok 4.20 Multi-Agent, 304 tok/s) beats Anthropic's (Claude Haiku 4.5, 89 tok/s).
- SpaceXAI publishes more open-weights models (1 vs 0).
- Anthropic ships more often: one model every 40 days against every 42.
Best model per price band
Each provider’s highest-index model below the price ceiling. Purple marks the winner of the band.
| Price band | Anthropic | SpaceXAI |
|---|---|---|
| Under $0.50/M | – | – |
| Under $2/M | Claude 3 Haiku 37.5$0.500/M | Grok 4.20 thinking 59.9$1.56/M |
| Under $10/M | Claude Sonnet 5 high 62.1$4.00/M | Grok 4.6 medium 66.0$3.00/M |
| Any price | Claude Fable 5.1 high 71.9$20.00/M | Grok 4.6 medium 66.0$3.00/M |
Line-up
| Metric | Anthropic | SpaceXAI |
|---|---|---|
| Flagship index | 71.9 | 66.0 |
| Ranked models | 20 | 16 |
| Open-weights models | 0 | 1 |
| Cheapest ranked, $/M | $0.500 | $1.25 |
| Fastest ranked, tok/s | 89 | 304 |
| Release cadence, days | 40 | 42 |
| Last release | 1 Sept 2026 | 21 Sept 2026 |
| Next expected | 25 Sept 2026 – 27 Oct 2026 | 16 Oct 2026 – 18 Nov 2026 |
Data as of 21 Sept 2026. See Anthropic and SpaceXAI in full.