AI model comparison
Grok 4.6 vs GPT-5.6 Sol
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
xAI
Grok 4.6
Grok 4.6 is a model from SpaceXAI with frontier performance on coding, knowledge work, and STEM.
- Input / 1M
- $2
- Output / 1M
- $6
- Context
- 500K
OpenAI
GPT-5.6 Sol
GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series.
- Input / 1M
- $2
- Output / 1M
- $10
- Context
- 1.05M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Grok 4.6
1.3x cheaper for a typical chat
Higher intelligence score
GPT-5.6 Sol
47 vs 44.3 on Artificial Analysis
Larger context window
GPT-5.6 Sol
1.05M vs 500K tokens
Newer release
Grok 4.6
Released August 12, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
GPT-5.6 Sol47Coding index
GPT-5.6 Sol77.4Agentic index
GPT-5.6 Sol50.2Pricing
Grok 4.6 vs GPT-5.6 Sol API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | GPT-5.6 Sol | |
|---|---|---|
| Input tokensPer 1M tokens | $2 | $2 |
| Output tokensPer 1M tokens | $6 | $10 |
| Cached input (read)Per 1M tokens | $0.50 | $0.20 |
| Cache writePer 1M tokens | Not available | $2.50 |
| Long-context pricingPer 1M tokens, for very long prompts | $4 in / $12 out above 200K | $4 in / $15 out above 272K |
| Web searchPer request | $0.005 | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
GPT-5.6 Sol$9Coding task
30K in, 4K out
GPT-5.6 Sol$100$46 cachedLong document summary
150K in, 2K out
GPT-5.6 Sol$320$50 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | GPT-5.6 Sol | |
|---|---|---|
| Context window | 500K tokens | 1.05M tokens |
| Max output | 450K tokens | 128K tokens |
| Input types | File, Image, Text | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Extra high, High, Medium, Low | Max, Extra high, High, Medium, Low, None |
| Default reasoning effort | High | Medium |
| Release date | August 12, 2026 | July 9, 2026 |
Features
Supported features
API features available for each model.
| Metric | GPT-5.6 Sol | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
GPT-5.6 SolView full model details- GPT-5.6 Sol vs Claude Opus 5.5
- GPT-5.6 Sol vs Claude Sonnet 5.5
- GPT-5.6 Sol vs Claude Fable 5.1
- GPT-5.6 Sol vs GPT-6 Astra
- GPT-5.6 Sol vs GPT-6.1 Sol
- GPT-5.6 Sol vs Claude Opus 5
- GPT-5.6 Sol vs Claude Fable 5
- GPT-5.6 Sol vs Muse Spark 1.3
- GPT-5.6 Sol vs GPT-6 Sol
- GPT-5.6 Sol vs Grok 4.7
- GPT-5.6 Sol vs MiMo-V2.6-Pro
- GPT-5.6 Sol vs Qwen3.8 Max (0902)
- GPT-5.6 Sol vs GLM 5.3
- GPT-5.6 Sol vs Kimi K3
- GPT-5.6 Sol vs GPT-5.6 Terra
- GPT-5.6 Sol vs GPT-5.4
Our take
Grok 4.6 is 1.3x cheaper for a typical chat. GPT-5.6 Sol scores higher on the Artificial Analysis Intelligence Index (47 vs 44.3). GPT-5.6 Sol has the larger context window (1.05M vs 500K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Grok 4.6 or GPT-5.6 Sol cheaper?
Grok 4.6 is cheaper for a typical chat (2K input tokens and 500 output tokens). Grok 4.6 costs $2 per 1M input tokens and $6 per 1M output tokens, while GPT-5.6 Sol costs $2 per 1M input tokens and $10 per 1M output tokens.
Which has a bigger context window, Grok 4.6 or GPT-5.6 Sol?
GPT-5.6 Sol supports up to 1.05M tokens of context, compared with 500K for Grok 4.6.
Is Grok 4.6 smarter than GPT-5.6 Sol?
On the Artificial Analysis Intelligence Index, Grok 4.6 scores 44.3 and GPT-5.6 Sol scores 47, putting GPT-5.6 Sol ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Grok 4.6 and GPT-5.6 Sol at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Grok 4.6 and GPT-5.6 Sol answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Grok 4.6 and GPT-5.6 Sol at the same time. Compare the answers side by side and keep the best one.