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Claude Sonnet 5.5 vs Grok 4.7
Claude Sonnet 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, Claude Sonnet 5.5 is at 83.3 and Grok 4.7 at 45.2 (out of 100). On each maker's API, Claude Sonnet 5.5 costs $2 / $10 per 1M tokens (input / output) and Grok 4.7 $2 / $6.
Scores as published by each board; table composed November 13, 2026.
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Leaderboard by leaderboard
| Board | Claude Sonnet 5.5 | Grok 4.7 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,772.3 | 1,640.7 | Claude Sonnet 5.5 |
| LiveBench global average (0-100) | 77 | 67.9 | Claude Sonnet 5.5 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 70.9 | 58.6 | Claude Sonnet 5.5 |
| Artificial Analysis intelligence index · measured runs only | 54.5 | 35.5 | Claude Sonnet 5.5 |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 166.6 | 156.2 | Claude Sonnet 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, Claude Sonnet 5.5 is at 65.1 (#16 of 48) and Grok 4.7 at 40.7 (#26). Claude Sonnet 5.5 scores higher on all 3 coding boards that rate both.
| Coding board | Claude Sonnet 5.5 | Grok 4.7 |
|---|---|---|
| LMArena · Coding | 1,500.9 | 1,425.3 |
| LiveBench · Coding | 77.2 | 73.1 |
| Vals Vibe Code Bench | 92.4 | 86.2 |
Claude Sonnet 5.5 at a glance
- Developer
- Anthropic
- Status
- Live since September 28, 2026
- API price
- $2 input / $10 output per 1M tokens · Anthropic, claude-sonnet-5-5
- Context window
- 1M tokens
Live — Sep 28 · $2/$10 per MTok, the same as Sonnet 5 · cache reads $0.20 at launch, halved to $0.10 on Oct 7, writes $2.50 · in the API, the Claude apps, AWS, Google Cloud and Azure the same day · 1M ctx / 128K out · knowledge cutoff Jun 2026 · Artificial Analysis Intelligence Index 56 at max effort, #3 of 216 reasoning models (read Sep 28) · Anthropic's own table: Terminal-Bench 4.0 70.6% (Opus 5.5 66.4%), OSWorld 2.1 80.1% (Opus 5.5 81.8%) · our sweep caught claude-sonnet-5-5 at 17:54 UTC and fired at 17:55.
Claude Sonnet 5.5 ships at Sonnet 5's price, and the first independent number puts it #3 among reasoning models
2026-09-28 · Claude Sonnet 5.5 is live. Our sweep read the id claude-sonnet-5-5 at 17:54:45 UTC on September 28 and the alert went out at 17:55:45, 60 seconds later, to 314 inboxes and one phone. OpenRouter listed it nine minutes after that.
Claude Sonnet 5.5: named by Anthropic, reportedly in partner testing, priced 89% by Sep 30
2026-09-27 · Anthropic has named Claude Sonnet 5.5 but has not dated it. Everything past the name is reported, not confirmed - and the one number that moves every day says it is close.
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 Sonnet 5.5 vs Grok 4.7: quick answers
Which is better, Claude Sonnet 5.5 or Grok 4.7?
It depends on what you measure. Claude Sonnet 5.5 scores higher than Grok 4.7 on all 5 public leaderboards that rate both. Claude Sonnet 5.5's widest lead is on Vals AI. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Sonnet 5.5 is at 83.3 and Grok 4.7 at 45.2 (out of 100).
Which is newer, Claude Sonnet 5.5 or Grok 4.7?
Claude Sonnet 5.5. It went live on September 28, 2026, 7 days after Grok 4.7 (September 21, 2026).
Which is cheaper, Claude Sonnet 5.5 or Grok 4.7?
Grok 4.7 is cheaper on output; input costs the same. On each vendor's own API, Claude Sonnet 5.5 is $2 input / $10 output per million tokens and Grok 4.7 is $2 input / $6 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, Claude Sonnet 5.5 or Grok 4.7?
Claude Sonnet 5.5, at 1M tokens against Grok 4.7's 500K, as each vendor lists it.
How do Claude Sonnet 5.5 and Grok 4.7 compare for coding?
On the ArtificialWatch coding index, Claude Sonnet 5.5 is at 65.1 (#16 of 48) and Grok 4.7 at 40.7 (#26). Claude Sonnet 5.5 scores higher on all 3 coding boards that rate both.
Who makes Claude Sonnet 5.5 and Grok 4.7?
Claude Sonnet 5.5 is from Anthropic; Grok 4.7 is from xAI.
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