GPT-5.6 Sol vs Grok 4.3 — Price, Context, and Capability Compared
Verdict
GPT-5.6 Sol costs 7.2× more per blended million tokens than Grok 4.3. Grok 4.3 has the larger context window (1,000,000 tokens). Default to Grok 4.3 unless you specifically need GPT-5.6 Sol's edge.
Spec comparison
| GPT-5.6 Sol | Grok 4.3 | |
|---|---|---|
| Price (input) | $5.00/M | $1.25/M ✓ |
| Price (output) | $30.00/M | $2.50/M ✓ |
| Blended price | $11.25/M | $1.56/M ✓ |
| Context window | 400,000 tokens | 1,000,000 tokens ✓ |
| Max output | 128,000 tokens ✓ | 64,000 tokens |
| Modalities | text, vision | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-06 | 2026-06 |
| Speed | 44 t/s | 98 t/s ✓ |
Cost at scale (3:1 blended)
| Tokens / month | GPT-5.6 Sol | Grok 4.3 | Delta |
|---|---|---|---|
| 1,000,000 | $11.25 | $1.56 | $9.69 (7.2×) |
| 10,000,000 | $112.50 | $15.63 | $96.88 (7.2×) |
| 100,000,000 | $1125.00 | $156.25 | $968.75 (7.2×) |
Choose GPT-5.6 Sol if…
- ✓Strongest OpenAI model for agentic, long-horizon coding
- ✓Deep reasoning mode for multi-step planning
- ✓Native vision input
- ✓Complex, multi-step professional and coding work where accuracy matters more than cost.
Choose Grok 4.3 if…
- ✓xAI’s general-purpose flagship
- ✓Extremely fast for its size
- ✓1M-token context
- ✓General-purpose work where speed and a huge context window both matter.
Run this exact matchup right now
Send the same prompt to GPT-5.6 Sol and Grok 4.3 side by side and see the outputs yourself.
Try GPT-5.6 Sol vs Grok 4.3 FreeFAQ
Is GPT-5.6 Sol cheaper than Grok 4.3?
Grok 4.3 is cheaper, at $1.56 per million blended tokens vs $11.25 for GPT-5.6 Sol.
Which has the bigger context window, GPT-5.6 Sol or Grok 4.3?
Grok 4.3 has the larger context window: 1,000,000 tokens vs 400,000.
Can GPT-5.6 Sol replace Grok 4.3 for coding?
Both are viable for coding. Strongest OpenAI model for agentic, long-horizon coding (GPT-5.6 Sol) vs xAI’s general-purpose flagship (Grok 4.3) — pick based on which strength matters more for your workload.
Which is faster, GPT-5.6 Sol or Grok 4.3?
Grok 4.3 is faster: 98 t/s vs 44 t/s, measured on our speed benchmarks.
Related
Pricing verified 2026-05-19. Specs verified 2026-08-08.
