Anthropic vs xAI (SpaceXAI)
Head-to-head for the week of 26 Oct 2026.
| Metric | Anthropic | xAI (SpaceXAI) | Leads |
|---|---|---|---|
| Score | 97.2 5/5 | 58.3 5/5 | Anthropic |
| Rank | #1 | #5 | Anthropic |
| Coverage | 5/5 | 5/5 | n/a |
| Arena text (rank, score, model) | #2 · 1509 Claude Opus 5.5 (High) | #39 · 1475 Grok 4.20 Beta 1 | Anthropic |
| AA Intelligence Index (index, position, model) | 57.6 · #1 Claude Opus 5.5 (Max, Default Fallback) | 46.4 · #25 Grok 4.7 (Xhigh) | Anthropic |
| Revenue run-rate | $67.2B Q3 2026 revenue × 4 (computed; $16.8B quarter told to investors, gross accounting) 30 Sept 2026 · CNBC (also Reuters, Bloomberg, FT) (opens in new tab) | $30.2B Q3 2026 Super Intelligence (SI) segment revenue × 4 (computed; segment includes compute rental, Cursor and X ads) 30 Sept 2026 · SpaceX Q3 2026 results (SEC 8-K) (opens in new tab) | Anthropic |
| Valuation (latest closed) | $965B post-money, Series H 28 May 2026 · Anthropic (opens in new tab) | $250B implied value in the SpaceX all-stock merger 2 Feb 2026 · Reuters (opens in new tab) | Anthropic |
| Total funding (not scored) | $141B 30 Jun 2026 · Anthropic S-1 (SEC EDGAR) (opens in new tab) | No reliable public figure. | n/a |
| Polymarket 2026 #1 odds · Change vs 19 Oct 2026 | 53.5% +4pp | 0.95% −0.7pp | Anthropic |
| Arena component | 92 | 58 | Anthropic |
| AA component | 100 | 80.6 | Anthropic |
| Revenue component | 100 | 87.7 | Anthropic |
| Valuation component | 100 | 80.3 | Anthropic |
| Odds component | 100 | 1.8 | Anthropic |
Arena: manual snapshot as of 22 Oct 2026 (source). Artificial Analysis: fetched 26 Oct 2026 (source). Polymarket: fetched 26 Oct 2026 (primary market).
Other prediction markets
Which company has the best AI model end of October?
Anthropic11.8%
xAI (SpaceXAI)not in top 4
Which company has the best AI model end of November?
Anthropic45.5%
xAI (SpaceXAI)not in top 4
Compute (not scored)
Anthropic
- Compute contracted since Oct 2025: ≥14.8 GW (6 Sept 2026 · The Information via AI-RTZ (opens in new tab))
- Anthropic-Amazon New Carlisle, current IT power (est.): ~910 MW (15 Oct 2026 · Epoch AI (opens in new tab))
- Fixed/minimum compute & infrastructure commitments: ~$265.6B (30 Jun 2026 · Anthropic S-1, Note 13 (SEC EDGAR) (opens in new tab))
xAI (SpaceXAI)
- Colossus 2, current IT power (est.), largest tracked: ~946 MW (15 Oct 2026 · Epoch AI (opens in new tab))
- AI-segment capex, Q1 2026: $7.7B (31 Mar 2026 · TechCrunch (S-1) (opens in new tab))
Compute figures use different methodologies across labs, so they're listed, not scored; see /compute/ for the comparable Epoch AI estimates (methodology).
History
| Week | Anthropic | xAI (SpaceXAI) |
|---|---|---|
| 10 Oct 2026 backfilled | #2 · 93.9 | #6 · 49.7 |
| 17 Oct 2026 | #1 · 94.4 | #6 · 49.4 |
| 19 Oct 2026 | #1 · 94.4 | #6 · 49.3 |
| 22 Oct 2026 | #2 · 94.4 | #6 · 49.2 |
| 26 Oct 2026 | #1 · 97.2 | #5 · 58.3 |
FAQ
Which scores higher, Anthropic or xAI (SpaceXAI)?
Anthropic (97.2/100 vs 58.3/100).
Which ranks higher on the Arena leaderboard?
Anthropic (#2 vs #39).
Which has the higher revenue run-rate?
Anthropic ($67.2B vs $30.2B).
Which has the higher 2026 Polymarket odds of the best AI model?
Anthropic (53.5% vs 0.95%).