GPT-5.4 Mini vs Grok 4.3
GPT-5.4 Mini (2026) and Grok 4.3 (2026) are frontier-tier reasoning models from OpenAI and xAI. GPT-5.4 Mini ships a 400K-token context window, while Grok 4.3 ships a 1M-token context window. On pricing, GPT-5.4 Mini costs $0.75/1M input tokens versus $1.25/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
GPT-5.4 Mini is ~67% cheaper at $0.75/1M; pay for Grok 4.3 only for long-context analysis.
Decision scorecard
Local evidence first| Signal | GPT-5.4 Mini | Grok 4.3 |
|---|---|---|
| Decision fit | Coding, RAG, and Agents | RAG, Agents, and Long context |
| Context window | 400K | 1M |
| Cheapest output | $4.5/1M tokens | $2.5/1M tokens |
| Provider routes | 2 tracked | 2 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- GPT-5.4 Mini uniquely exposes Code execution in local model data.
- Local decision data tags GPT-5.4 Mini for Coding, RAG, and Agents.
- Grok 4.3 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Grok 4.3 has the lower cheapest tracked output price at $2.5/1M tokens.
- Grok 4.3 uniquely exposes Vision in local model data.
- Local decision data tags Grok 4.3 for RAG, Agents, and Long context.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
GPT-5.4 Mini
$1,725
Cheapest tracked route: OpenAI API
Grok 4.3
$1,625
Cheapest tracked route: xAI Console
Estimated monthly gap: $100. Batch, cache, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Grok 4.3 is $2/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Code execution before moving production traffic.
- Grok 4.3 adds Vision in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- GPT-5.4 Mini is $2/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Vision before moving production traffic.
- GPT-5.4 Mini adds Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-03-05 | 2026-05-05 |
| Context window | 400K | 1M |
| Parameters | — | ~0.5T |
| Architecture | decoder only | - |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-08 | - |
Pricing and availability
| Pricing attribute | GPT-5.4 Mini | Grok 4.3 |
|---|---|---|
| Input price | $0.75/1M tokens | $1.25/1M tokens |
| Output price | $4.5/1M tokens | $2.5/1M tokens |
| Providers |
Capabilities
| Capability | GPT-5.4 Mini | Grok 4.3 |
|---|---|---|
| Vision | No | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: Grok 4.3 and code execution: GPT-5.4 Mini. Both models share multimodal input, reasoning mode, function calling, and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, GPT-5.4 Mini lists $0.75/1M input and $4.5/1M output tokens, while Grok 4.3 lists $1.25/1M input and $2.5/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Grok 4.3 lower by about $0.25 per million blended tokens. Availability is 2 providers versus 2, so concentration risk also matters.
Choose GPT-5.4 Mini when coding workflow support and lower input-token cost are central to the workload. Choose Grok 4.3 when long-context analysis and larger context windows are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which has a larger context window, GPT-5.4 Mini or Grok 4.3?
Grok 4.3 supports 1M tokens, while GPT-5.4 Mini supports 400K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, GPT-5.4 Mini or Grok 4.3?
GPT-5.4 Mini is cheaper on tracked token pricing. GPT-5.4 Mini costs $0.75/1M input and $4.5/1M output tokens. Grok 4.3 costs $1.25/1M input and $2.5/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is GPT-5.4 Mini or Grok 4.3 open source?
GPT-5.4 Mini is listed under Proprietary. Grok 4.3 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, GPT-5.4 Mini or Grok 4.3?
Grok 4.3 has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, GPT-5.4 Mini or Grok 4.3?
Both GPT-5.4 Mini and Grok 4.3 expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Where can I run GPT-5.4 Mini and Grok 4.3?
GPT-5.4 Mini is available on OpenAI API and OpenRouter. Grok 4.3 is available on xAI Console and OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-14. Data sourced from public model cards and provider documentation.