GPT-5.6 Terra vs Grok 4.6
GPT-5.6 Terra and Grok 4.6 are closely matched at 52.6 and 47.0 on the LLM Stats Score. Grok 4.6 is 1.5x cheaper per token.
OpenAI · xAI · Updated for 2026
Which is better?
GPT-5.6 Terra and Grok 4.6 are closely matched on the overall LLM Stats Score at 52.6 and 47.0.
In the 1 individual benchmarks reported for both models, GPT-5.6 Terra wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Grok 4.6 is roughly 1.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.6 Terra 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 LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-5.6 Terra
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- you process long inputs — it offers a 1,050,000 token context window
Choose Grok 4.6
- cost matters — it's about 1.5x cheaper per token
- you want the most recent training data — it shipped Aug 2026
At a glance
The differences that matter most.
Individual benchmarks
44 reported for GPT-5.6 Terra · 10 for Grok 4.6
GPT-5.6 Terra outperforms in 1 benchmarks (DeepSWE 1.1), while Grok 4.6 is better at 0 benchmarks.
GPT-5.6 Terra 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, GPT-5.6 Terra ($2.00/1M tokens) costs the same as Grok 4.6 ($2.00/1M tokens).
For output processing, GPT-5.6 Terra ($12.00/1M tokens) is 2.0x more expensive than Grok 4.6 ($6.00/1M tokens).
In conclusion, GPT-5.6 Terra 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-5.6 Terra accepts 1,050,000 input tokens compared to Grok 4.6's 500,000 tokens. Only GPT-5.6 Terra specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
Both GPT-5.6 Terra and Grok 4.6 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.6 Terra
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-5.6 Terra was released on 2026-07-09, while Grok 4.6 was released on 2026-08-12.
Grok 4.6 is 1 month newer than GPT-5.6 Terra.
Jul 9, 2026
1 months ago
Aug 12, 2026
2 weeks ago
1mo newerKnowledge Cutoff
When training data ends
GPT-5.6 Terra has a knowledge cutoff of 2026-02-16, while Grok 4.6 has a cutoff of 2026-02-01.
GPT-5.6 Terra has more recent training data (up to 2026-02-16), making it potentially better informed about events through that date compared to Grok 4.6 (2026-02-01).
Feb 2026
Feb 2026
Provider Availability
GPT-5.6 Terra is available from OpenAI. Grok 4.6 is available from xAI.
GPT-5.6 Terra
Grok 4.6
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.6 Terra and Grok 4.6 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.6 Terra vs Grok 4.6.