GPT-5 nano vs Grok 4.3
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
GPT-5 nano
OpenAI · Aug 2025
OpenAI's cheapest model — $0.05 per million input tokens — for latency-critical routing, autocomplete and bulk tagging.
Grok 4.3
xAI · Apr 2026
xAI's frontier model: 1M context at $1.25/$2.50, ~168 tokens/sec, and a record low hallucination rate on independent testing.
The verdict
These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: GPT-5 nano works out roughly 11x cheaper per blended million tokens. Grok 4.3 also takes 1M of context versus 400K for GPT-5 nano.
Specs & pricing
| GPT-5 nano | Grok 4.3 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $0.05 | $1.25 |
| Output price / 1M | $0.4 | $2.5 |
| Context window | 400K | 1M |
| Max output | 128K | — |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text, image |
| Knowledge cutoff | May 2024 | Mar 2026 |
| Released | Aug 2025 | Apr 2026 |
| Example monthly cost* | $1.10 | $16.25 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, GPT-5 nano or Grok 4.3?
- These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: GPT-5 nano works out roughly 11x cheaper per blended million tokens. Grok 4.3 also takes 1M of context versus 400K for GPT-5 nano.
- Which is cheaper, GPT-5 nano or Grok 4.3?
- GPT-5 nano costs $0.05/$0.4 per million input/output tokens, while Grok 4.3 costs $1.25/$2.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $1.10 versus $16.25.
- Which model is better for coding, GPT-5 nano or Grok 4.3?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.