Claude Opus 5.5 vs Grok 4.7
Claude Opus 5.5 leads the LLM Stats Score 59.8 to 48.3. Grok 4.7 is 2.7x cheaper per token.
Anthropic · xAI · Updated for 2026
Which is better?
Claude Opus 5.5 leads the overall LLM Stats Score 59.8 to 48.3, ranking #1 overall.
In the 6 individual benchmarks reported for both models, Claude Opus 5.5 wins 6; this is a narrower head-to-head signal than the composite indexes.
On price, Grok 4.7 is roughly 2.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Opus 5.5 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Opus 5.5
- overall performance matters — it scores 59.8 and ranks #1 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 6 of 6 exact shared results
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Sep 2026
Choose Grok 4.7
- cost matters — it's about 2.7x cheaper per token
At a glance
The differences that matter most.
Individual benchmarks
31 reported for Claude Opus 5.5 · 23 for Grok 4.7
Claude Opus 5.5 outperforms in 6 benchmarks (AA-Briefcase v1.1, CursorBench 4.0, DeepSWE 1.1, FrontierSWE V2, HealthBench Professional, Terminal-Bench 4.0), while Grok 4.7 is better at 0 benchmarks.
Claude Opus 5.5 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 2.0x more expensive than Grok 4.7 ($2.00/1M tokens).
For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 3.3x more expensive than Grok 4.7 ($6.00/1M tokens).
In conclusion, Claude Opus 5.5 is more expensive than Grok 4.7.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Opus 5.5 accepts 1,000,000 input tokens compared to Grok 4.7's 500,000 tokens. Only Claude Opus 5.5 specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
Both Claude Opus 5.5 and Grok 4.7 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Opus 5.5
Grok 4.7
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Opus 5.5 was released on 2026-09-22, while Grok 4.7 was released on 2026-09-21.
Claude Opus 5.5 is 0 month newer than Grok 4.7.
Sep 22, 2026
0 days ago
1d newerSep 21, 2026
1 days ago
Knowledge Cutoff
When training data ends
Both models have the same knowledge cutoff date of 2026-06-01.
They should have similar awareness of historical events and information up to this date.
Jun 2026
Jun 2026
Provider Availability
Claude Opus 5.5 is available from Anthropic. Grok 4.7 is available from xAI.
Claude Opus 5.5
Grok 4.7
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 5.5 and Grok 4.7 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 5.5 vs Grok 4.7.