GPT-5.5 vs Grok 4.6
GPT-5.5 significantly outperforms across most benchmarks. Grok 4.6 is 3.8x cheaper per token.
OpenAI · xAI · Updated for 2026
Which is better?
GPT-5.5 outperforms in 1 benchmarks (DeepSWE 1.1), while Grok 4.6 is better at 0 benchmarks. GPT-5.5 significantly outperforms across most benchmarks.
On price, Grok 4.6 is roughly 3.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.5 also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current benchmark, pricing, and model metadata for 2026.
Choose GPT-5.5
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- you process long inputs — it offers a 1,050,000 token context window
Choose Grok 4.6
- cost matters — it's about 3.8x cheaper per token
- you want the most recent training data — it shipped Aug 2026
At a glance
The differences that matter most.
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.5 outperforms in 1 benchmarks (DeepSWE 1.1), while Grok 4.6 is better at 0 benchmarks.
GPT-5.5 significantly outperforms across most benchmarks.
Arena Performance
Playground indexes and blind preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.5 ($5.00/1M tokens) is 2.5x more expensive than Grok 4.6 ($2.00/1M tokens).
For output processing, GPT-5.5 ($30.00/1M tokens) is 5.0x more expensive than Grok 4.6 ($6.00/1M tokens).
In conclusion, GPT-5.5 is more expensive than Grok 4.6.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-5.5 accepts 1,050,000 input tokens compared to Grok 4.6's 500,000 tokens. Only GPT-5.5 specifies output context (128,000 tokens).
Input Capabilities
Supported data types and modalities
Both GPT-5.5 and Grok 4.6 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.5
Grok 4.6
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
GPT-5.5 was released on 2026-04-23, while Grok 4.6 was released on 2026-08-12.
Grok 4.6 is 4 months newer than GPT-5.5.
Apr 23, 2026
4 months ago
Aug 12, 2026
1 weeks ago
3mo newerKnowledge Cutoff
When training data ends
GPT-5.5 has a knowledge cutoff of 2025-12-01, while Grok 4.6 has a cutoff of 2026-02-01.
Grok 4.6 has more recent training data (up to 2026-02-01), making it potentially better informed about events through that date compared to GPT-5.5 (2025-12-01).
Dec 2025
Feb 2026
2 mo newerProvider Availability
GPT-5.5 is available from OpenAI. Grok 4.6 is available from xAI.
GPT-5.5
Grok 4.6
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.5 and Grok 4.6 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.5 vs Grok 4.6.