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Grok 4.7 vs Claude Opus 5.5
Claude Opus 5.5 scores higher than Grok 4.7 on all 5 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Grok 4.7 is at 45.2 and Claude Opus 5.5 at 90.9 (out of 100). On each maker's API, Grok 4.7 costs $2 / $6 per 1M tokens (input / output) and Claude Opus 5.5 $4 / $20.
Scores as published by each board; table composed November 13, 2026.
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Leaderboard by leaderboard
| Board | Grok 4.7 | Claude Opus 5.5 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,640.7 | 1,814.7 | Claude Opus 5.5 |
| LiveBench global average (0-100) | 67.9 | 83.4 | Claude Opus 5.5 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 58.6 | 70.1 | Claude Opus 5.5 |
| Artificial Analysis intelligence index · measured runs only | 35.5 | 59.1 | Claude Opus 5.5 |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 156.2 | 168.5 | Claude Opus 5.5 |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Grok 4.7 is at 40.7 (#26 of 48) and Claude Opus 5.5 at 90 (#3). Claude Opus 5.5 scores higher on all 3 coding boards that rate both.
| Coding board | Grok 4.7 | Claude Opus 5.5 |
|---|---|---|
| LMArena · Coding | 1,425.3 | 1,543.4 |
| LiveBench · Coding | 73.1 | 87.1 |
| Vals Vibe Code Bench | 86.2 | 90.3 |
Grok 4.7 at a glance
- Developer
- xAI
- Status
- Live since September 21, 2026
- API price
- $2 input / $6 output per 1M tokens · xAI, grok-4.7
- Context window
- 500K tokens
Live — Sep 21 · 500k ctx · $2/$6 per 1M under a 200k prompt, $4/$12 over it, $0.50 cached — unchanged from 4.6 · Artificial Analysis: Intelligence Index 46 (+2), 4th on the Coding Agent Index at 56 with Grok Build, AA-Briefcase 1657 Elo (+111) alongside Opus 5 and Fable 5.1 · burns ~81k output tokens per index task at xhigh, 2.25x Grok 4.6.
Grok 4.7 puts xAI in the top four - and it buys that with three times the tokens
2026-09-21 · xAI shipped Grok 4.7 today. Our radar read the id at 15:49:44 UTC, confirmed it on the next sweep and sent 307 alerts 61 seconds after first sight.
Musk says Grok 4.6 ships next week — on the earnings call where SpaceX stock fell 8%
2026-08-05 · SpaceX held its first public earnings call yesterday. Grok was on the agenda, and the version of it circulating as a bullet list flattens three very different levels of certainty into one. Here they are separated.
Claude Opus 5.5 at a glance
- Developer
- Anthropic
- Status
- Live since September 22, 2026
- API price
- $4 input / $20 output per 1M tokens · Anthropic, claude-opus-5-5
- Context window
- 1M tokens
Live — Sep 22 · $4/$20 per MTok, down from Opus 5 at $5/$25 · 1M ctx / 128K out · adaptive thinking always on, default effort medium · cache reads 5% of base input · Anthropic now says start here for most workloads, and Opus 5 is legacy · fast mode (speed: 'fast', up to 2.5x the output tokens per second by Anthropic's figure) at $8 / $40 per MTok, double standard, left research preview Oct 15 with no waitlist, access request or beta header; on the Claude API and on Claude in Microsoft Foundry (Azure-hosted), not on Bedrock, Google Cloud, Claude Platform on AWS, the Batch API or Priority Tier; @ClaudeDevs says Google Cloud is coming soon (Anthropic's fast mode docs, read Oct 16).
AI models go live a median of 4 months after their knowledge ends: Claude Opus 5.5 knows up to June 2026, Gemini 4 Argon only to March
2026-11-06 · Of the 22 live AI models whose labs publish a knowledge cutoff, the median went live 4 months after its training data ends, by ArtificialWatch's count. The latest published cutoff we found is June 2026, for Anthropic's four current Claude models and OpenAI's GPT-6.1 Terra.
SemiAnalysis launches GDPx: Opus 5.5 leads at 12%, Gemini 4 Carbon close behind
2026-11-02 · SemiAnalysis released GDPx on November 2, a new agentic benchmark of 206 tasks across 11 domains, and the best model it tested scores 12%. Claude Opus 5.5 leads at 12.0, Gemini 4 Carbon is second at 10.9 and GPT-6 Astra third at 9.6. We read the leaderboard directly at gdpx.semianalysis.com.
Grok 4.7 vs Claude Opus 5.5: quick answers
Which is better, Grok 4.7 or Claude Opus 5.5?
It depends on what you measure. Claude Opus 5.5 scores higher than Grok 4.7 on all 5 public leaderboards that rate both. Claude Opus 5.5's widest lead is on Epoch AI. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Grok 4.7 is at 45.2 and Claude Opus 5.5 at 90.9 (out of 100).
Which is newer, Grok 4.7 or Claude Opus 5.5?
Claude Opus 5.5. It went live on September 22, 2026, 1 day after Grok 4.7 (September 21, 2026).
Which is cheaper, Grok 4.7 or Claude Opus 5.5?
Grok 4.7 is cheaper on both input and output. On each vendor's own API, Grok 4.7 is $2 input / $6 output per million tokens and Claude Opus 5.5 is $4 input / $20 output per million tokens. Grok 4.7's rate rises for prompts over 200K tokens. Prices as published in the models.dev catalog, as of 2026-11-12.
Which has the bigger context window, Grok 4.7 or Claude Opus 5.5?
Claude Opus 5.5, at 1M tokens against Grok 4.7's 500K, as each vendor lists it.
How do Grok 4.7 and Claude Opus 5.5 compare for coding?
On the ArtificialWatch coding index, Grok 4.7 is at 40.7 (#26 of 48) and Claude Opus 5.5 at 90 (#3). Claude Opus 5.5 scores higher on all 3 coding boards that rate both.
Who makes Grok 4.7 and Claude Opus 5.5?
Grok 4.7 is from xAI; Claude Opus 5.5 is from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 13, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · what a workload costs on each · the wire