GPT-5.6 Sol vs Grok 4.3
OpenAI vs xAI · Prices checked 12 August 2026
There is a 7.7× price gap here. Grok 4.3 blends to $1.63 per million tokens; GPT-5.6 Sol to $12.50. A single 100K-input, 10K-output job costs $0.150 on Grok 4.3 against $0.800 on GPT-5.6 Sol.
GPT-5.6 Sol reads more in one request: 1,050,000 tokens of context against 1,000,000. GPT-5.6 Sol was released Jul 2026; Grok 4.3 Apr 2026.
Pricing and capacity
| Metric | GPT-5.6 Sol | Grok 4.3 | Difference |
|---|---|---|---|
| Input / 1M tokens | $5.00 | $1.25 | 4.0× |
| Output / 1M tokens | $30.00 | $2.50 | 12.0× |
| Blended · 70/30calculated | $12.50 | $1.63 | 7.7× |
| Blended · 50/50calculated | $17.50 | $1.88 | 9.3× |
| Blended · 80/20calculated | $10.00 | $1.50 | 6.7× |
| Blended · 20/80calculated | $25.00 | $2.25 | 11.1× |
| Job cost · 100K + 10Kcalculated | $0.800 | $0.150 | 5.3× |
| Job cost · 1M + 100Kcalculated | $8.00 | $1.50 | 5.3× |
| Context window | 1,050,000 | 1,000,000 | 5% |
Input and output rates are as published by each provider. Blended and job-cost rows are calculated comparison metrics, not published prices — how they are derived.
Benchmarks
These two models do not currently report scores on any of the same benchmark suites, so there is no like-for-like capability comparison to show. Rather than pad the page with one-sided numbers, the benchmark leaderboards list every score we do hold.
What each model is for
GPT-5.6 Sol
OpenAI · Frontier
The flagship tier of the GPT-5.6 family, aimed at complex reasoning, long-horizon agentic work, coding, biology and cybersecurity. In OpenAI's naming the number is the generation and Sol is a durable capability tier, so Sol advances on its own cadence rather than being replaced by the next decimal. Standard short-context pricing is $5/$30 per MTok with cached input at $0.50; requests above 272K tokens are billed at the long-context rate of $10/$45.
- Frontier reasoning
- Long-horizon agentic execution
- Coding and code review
- Programmatic tool calling in the Responses API
Grok 4.3
xAI · Frontier
xAI's current flagship, fully rolled out to the API at the end of April 2026 at $1.25/$2.50 per MTok, roughly 40% below its predecessor on input and 60% on output. It adds native video input, document generation for PDFs, spreadsheets and slides, improved tool-calling, and three adjustable reasoning-intensity levels, alongside a 1M-token context window.
- Aggressive pricing for a flagship tier
- Native video input
- Document generation (PDF, spreadsheet, slides)
- Three adjustable reasoning-intensity levels
Frequently asked questions
Which is cheaper, GPT-5.6 Sol or Grok 4.3?
There is a 7.7× price gap here. Grok 4.3 blends to $1.63 per million tokens; GPT-5.6 Sol to $12.50. A single 100K-input, 10K-output job costs $0.150 on Grok 4.3 against $0.800 on GPT-5.6 Sol. Blended cost weights input at 70% and output at 30%; price your own token split for an exact answer, since the cheaper model on a blended basis is not always cheaper for your workload.
Which has the larger context window, GPT-5.6 Sol or Grok 4.3?
GPT-5.6 Sol reads more in one request: 1,050,000 tokens of context against 1,000,000. The context window caps everything in a single request: prompt, retrieved documents, conversation history and the model’s own output all share it.
Can I compare GPT-5.6 Sol and Grok 4.3 on my own numbers?
Yes. Open both in the side-by-side comparison tool to see every field at once, or use the token calculator to price your actual prompt and monthly request volume against each model. Both are free and need no sign-up.
Price it for your own workload
Related matchups
Terms used on this page
Prices and scores are recomputed on every deploy from the catalogue. Prices checked 12 August 2026.