GPT-5.4 Pro vs Grok 4.3
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose GPT-5.4 Pro if you need
- ✓Choose Grok 4.3 if you need fast output at 134.99 t/s and low cost of $2.5 per million tokens.
- ✓Choose Grok 4.3 if you need strong multi-step reasoning plus integrated real-time tool access.
- ✓Choose Grok 4.3 if you need a 1M-token context for document tasks without extreme latency.
- ✓Choose Grok 4.3 if you need a known intelligence index of 43.9 and direct response style.
Choose Grok 4.3 if you need
- ✓Choose GPT-5.4 Pro if you need handling of very large inputs with strong text-image-file integration.
- ✓Choose GPT-5.4 Pro if you need advanced reasoning over a slightly larger 1.05M-token context.
- ✓Choose GPT-5.4 Pro if you need versatile document and visual task support across modalities.
- ✓Choose GPT-5.4 Pro if you need extended-context multimodal fusion despite higher cost.
Verdict
Grok 4.3 leads on measurable speed, price, and complex reasoning with real-time tools, while GPT-5.4 Pro offers marginally larger context and stronger stated multimodal integration. Grok 4.3 is far cheaper at $2.5/M vs $180/M and provides concrete performance numbers that GPT-5.4 Pro lacks. GPT-5.4 Pro edges out only where very large cross-modal file handling is the priority.
GPT-5.4 Pro vs Grok 4.3: side by side
| Spec | GPT-5.4 Pro | Grok 4.3 | Winner |
|---|---|---|---|
| Intelligence | — | 43.9 | Tie |
| Output speed | — | 135 t/s | Tie |
| Output price | $180.00/1M | $2.50/1M | Grok 4.3 |
| Context | 1050K | 1000K | GPT-5.4 Pro |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | OpenAI | xAI | Tie |
Detailed analysis
Pricing
Winner: Grok 4.3Grok 4.3 costs $2.5 per million tokens while GPT-5.4 Pro costs $180 per million tokens. This 72x price difference makes Grok 4.3 the clear choice for cost-sensitive workloads. No other pricing details are provided.
Speed & Latency
Winner: Grok 4.3Grok 4.3 reports 134.99 tokens per second output speed. GPT-5.4 Pro lists no speed figure but notes higher latency on maximum-length inputs. Grok therefore has the only concrete speed advantage.
Context & Multimodal Scale
Winner: TieGrok 4.3 offers a 1M-token context while GPT-5.4 Pro offers 1.05M tokens. GPT-5.4 Pro emphasizes stronger integration of text, image, and file data; Grok notes vision capabilities are less mature. The contexts are nearly identical in size.
Reasoning & Tools
Winner: Grok 4.3Grok 4.3 lists strong complex multi-step reasoning and integrated real-time tool access with a known intelligence index of 43.9. GPT-5.4 Pro lists advanced reasoning over extended contexts but provides no intelligence index. Grok supplies the only numeric performance metric.
GPT-5.4 Pro
Pros
- +Handles very large inputs across modalities
- +Strong integration of text, image, and file data
- +Advanced reasoning over extended contexts
- +Versatile for document and visual tasks
Cons
- –Higher latency on maximum-length inputs
- –No native audio or video support
- –Proprietary access with usage constraints
Grok 4.3
Pros
- +Strong performance on complex multi-step reasoning
- +Large context window for document-level tasks
- +Helpful and direct response style
- +Integrated real-time tool access
Cons
- –Vision capabilities less mature than specialized models
- –Occasional over-refusal on edge-case queries
- –High computational cost for maximum context usage
Summary: GPT-5.4 Pro vs Grok 4.3
Select Grok 4.3 for speed, cost, and documented reasoning performance. Select GPT-5.4 Pro when maximum multimodal file integration on a marginally larger context outweighs the steep price increase. Most users will find Grok 4.3 the more practical option given the available data.
Frequently asked questions
Grok 4.3 is better on speed, price, and measurable reasoning; GPT-5.4 Pro is better only for the most demanding cross-modal file integration.