High-volume, cost-sensitive work
Choose Grok 4.3
Grok 4.3 costs 7% less on a typical mix of three input tokens for every output token ($1.56 against $1.69 per million tokens).
GPT-5.4 Mini vs Grok 4.3: price, context and capabilities
Choose GPT-5.4 Mini for reused prompts and documents (RAG, agents), agentic coding and reasoning over long documents. Choose Grok 4.3 for high-volume, cost-sensitive work, writing and code generation, very long inputs, tool use and support agents and the latest release.
In short
- Grok 4.3 is 7% cheaper than GPT-5.4 Mini at the headline price ($1.56 / 1M tokens vs $1.69 / 1M tokens).
- Grok 4.3 reads more per request: 1M tokens against 400k.
- Grok 4.3 is the newer model (Apr 30, 2026, against Mar 17, 2026).
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose Grok 4.3
Grok 4.3 charges $2.50 per million output tokens, against $4.50 for GPT-5.4 Mini. Output dominates the bill when answers are long.
Reused prompts and documents (RAG, agents)
Choose GPT-5.4 Mini
GPT-5.4 Mini charges $0.08 per million cached input tokens, against $0.20 for Grok 4.3.
Very long inputs
Choose Grok 4.3
Grok 4.3 reads up to 1M tokens per request, against 400k for GPT-5.4 Mini.
Hardest reasoning tasks
Either one
They are practically level on the Artificial Analysis Intelligence Index (24.1 and 24.9).
Agentic coding
Choose GPT-5.4 Mini
GPT-5.4 Mini scores 52.3% on Terminal-Bench Hard, against 37.9% for Grok 4.3.
Tool use and support agents
Choose Grok 4.3
Grok 4.3 scores 97.7% on τ²-Bench (agentic tool use), against 83.3% for GPT-5.4 Mini.
Reasoning over long documents
Choose GPT-5.4 Mini
GPT-5.4 Mini scores 77% on Long-context reasoning (AA-LCR), against 73% for Grok 4.3.
Latest release
Choose Grok 4.3
Grok 4.3 is the newer release (Apr 30, 2026, against Mar 17, 2026 for GPT-5.4 Mini).
Monthly cost at three volumes
| Volume | GPT-5.4 Mini | Grok 4.3 | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $1.88 | $1.88 | = |
| Production: 20M input, 5M output tokens | $37.50 | $37.50 | = |
| Scale: 500M input, 100M output tokens | $825.00 | $875.00 | GPT-5.4 Mini, $50.00 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| GPT-5.4 Mini | Grok 4.3 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Category | Language models | Language models |
| Status | Legacy | Generally available |
| Headline price | $1.69 / 1M tokens | $1.56 / 1M tokens |
| Input | $0.75 / 1M tokens | $1.25 / 1M tokens |
| Output | $4.50 / 1M tokens | $2.50 / 1M tokens |
| Cached input | $0.075 / 1M tokens | $0.20 / 1M tokens |
| Context window | 400k | 1M |
| Max output | 128k | No data |
| Released | Mar 17, 2026 | Apr 30, 2026 |
| Knowledge cutoff | August 2025 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | gpt-5.4-mini | grok-4.3 |
Benchmarks side by side
Leader in bold.
| Benchmark | GPT-5.4 Mini | Grok 4.3 |
|---|---|---|
| Intelligence Index | 24.1 | 24.9 |
| Terminal-Bench Hard | 52.3% | 37.9% |
| SciCode | 52.1% | 48.3% |
| GPQA Diamond | 87.5% | 90.1% |
| Humanity's Last Exam | 28.1% | 37.2% |
| IFBench (instruction following) | 73.3% | 81.3% |
| τ²-Bench (agentic tool use) | 83.3% | 97.7% |
| MMMU-Pro (visual reasoning) | 73.3% | 78.1% |
| Long-context reasoning (AA-LCR) | 77% | 73% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose GPT-5.4 Mini or Grok 4.3?
Choose GPT-5.4 Mini for reused prompts and documents (RAG, agents), agentic coding and reasoning over long documents. Choose Grok 4.3 for high-volume, cost-sensitive work, writing and code generation, very long inputs, tool use and support agents and the latest release.
Which is cheaper, GPT-5.4 Mini or Grok 4.3?
Grok 4.3 is 7% cheaper than GPT-5.4 Mini at the headline price ($1.56 / 1M tokens vs $1.69 / 1M tokens).
Which has the larger context window, GPT-5.4 Mini or Grok 4.3?
Grok 4.3 reads more per request: 1M tokens against 400k.
What is the difference between GPT-5.4 Mini and Grok 4.3?
GPT-5.4 Mini is made by OpenAI and Grok 4.3 by xAI. Grok 4.3 is 7% cheaper than GPT-5.4 Mini at the headline price ($1.56 / 1M tokens vs $1.69 / 1M tokens). Grok 4.3 reads more per request: 1M tokens against 400k. Grok 4.3 is the newer model (Apr 30, 2026, against Mar 17, 2026).
Which is better for coding, GPT-5.4 Mini or Grok 4.3?
GPT-5.4 Mini scores 52.3% on Terminal-Bench Hard, against 37.9% for Grok 4.3.
How much do GPT-5.4 Mini and Grok 4.3 cost per month?
At 20 million input and 5 million output tokens a month, GPT-5.4 Mini costs $37.50 and Grok 4.3 costs $37.50, at standard rates.
Which is newer, GPT-5.4 Mini or Grok 4.3?
Grok 4.3 was released on Apr 30, 2026 and GPT-5.4 Mini on Mar 17, 2026.