GPT-5.4 nanovsGrok 4.20 Beta
GPT-5.4 nano | Grok 4.20 Beta | |
|---|---|---|
| API pricingUSD per 1M tokens · lower wins · base tier | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | $0.20 | $1.25 |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | $1.25 | $2.50 |
Cached input priceA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again. | $0.02 | $0.20 |
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $0.20Azure | — |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | $1.25Azure | — |
| Benchmarks | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 14% | 56% |
| BenchmarksPublished by one model only | ||
ARC-AGI-2Abstract reasoning — Puzzle-style tests of abstract reasoning and pattern-finding — the kind of thing people find easy but AIs often struggle with. Higher is better. | — | 53.3% |
| Overview | ||
| Company | OpenAI | SpaceXAI |
| Release date | Mar 17 2026 | Feb 17 2026 |
| Access | Proprietary | Proprietary |
Other comparisons
Frequently asked questions
Grok 4.20 Beta leads GPT-5.4 nano on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-5.4 nano is cheaper on both input and output: $0.20 vs $1.25 per million input tokens, and $1.25 vs $2.50 per million output tokens. Figures are base-tier rates. Grok 4.20 Beta shipped 28 days before GPT-5.4 nano, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On BullshitBench v2, Grok 4.20 Beta leads at 56% vs GPT-5.4 nano at 14%.
GPT-5.4 nano was released by OpenAI on Mar 17 2026.
Grok 4.20 Beta was released by SpaceXAI on Feb 17 2026.
GPT-5.4 nano is cheaper on both input and output: $0.20 vs $1.25 per million input tokens, and $1.25 vs $2.50 per million output tokens. Figures are base-tier rates. Rates are pay-as-you-go API prices verified on August 18, 2026.