High-volume, cost-sensitive work
Choose Grok 4.20 Non-Reasoning
Grok 4.20 Non-Reasoning costs 22% less on a typical mix of three input tokens for every output token ($1.56 against $2.00 per million tokens).
GPT-6.1 Terra Pro vs Grok 4.20 Non-Reasoning: price, context and capabilities
Choose GPT-6.1 Terra Pro for reused prompts and documents (RAG, agents) and the latest release. Choose Grok 4.20 Non-Reasoning for high-volume, cost-sensitive work and writing and code generation.
In short
- Grok 4.20 Non-Reasoning is 22% cheaper than GPT-6.1 Terra Pro at the headline price ($1.56 / 1M tokens vs $2.00 / 1M tokens).
- GPT-6.1 Terra Pro reads more per request: 1.05M tokens against 1M.
- GPT-6.1 Terra Pro is the newer model (Oct 26, 2026, against March 2026).
- Only GPT-6.1 Terra Pro offers reasoning.
- Only Grok 4.20 Non-Reasoning offers batch api.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose Grok 4.20 Non-Reasoning
Grok 4.20 Non-Reasoning charges $2.50 per million output tokens, against $5.00 for GPT-6.1 Terra Pro. Output dominates the bill when answers are long.
Reused prompts and documents (RAG, agents)
Choose GPT-6.1 Terra Pro
GPT-6.1 Terra Pro charges $0.05 per million cached input tokens, against $0.20 for Grok 4.20 Non-Reasoning.
Latest release
Choose GPT-6.1 Terra Pro
GPT-6.1 Terra Pro is the newer release (Oct 26, 2026, against March 2026 for Grok 4.20 Non-Reasoning).
Monthly cost at three volumes
| Volume | GPT-6.1 Terra Pro | Grok 4.20 Non-Reasoning | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $2.25 | $1.88 | Grok 4.20 Non-Reasoning, $0.38 less |
| Production: 20M input, 5M output tokens | $45.00 | $37.50 | Grok 4.20 Non-Reasoning, $7.50 less |
| Scale: 500M input, 100M output tokens | $1,000 | $875.00 | Grok 4.20 Non-Reasoning, $125.00 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| GPT-6.1 Terra Pro | Grok 4.20 Non-Reasoning | |
|---|---|---|
| Provider | OpenAI | xAI |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $2.00 / 1M tokens | $1.56 / 1M tokens |
| Input | $1.00 / 1M tokens | $1.25 / 1M tokens |
| Output | $5.00 / 1M tokens | $2.50 / 1M tokens |
| Cached input | $0.05 / 1M tokens | $0.20 / 1M tokens |
| Context window | 1.05M | 1M |
| Max output | 128k | No data |
| Released | Oct 26, 2026 | March 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching | Vision, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | gpt-6.1-terra-pro | grok-4.20-0309-non-reasoning |
Benchmarks side by side
Leader in bold.
| Benchmark | GPT-6.1 Terra Pro | Grok 4.20 Non-Reasoning |
|---|---|---|
| Terminal-Bench Hard | No data | 16.7% |
| GPQA Diamond | No data | 77.6% |
| Humanity's Last Exam | No data | 27.9% |
| IFBench (instruction following) | No data | 49.3% |
| τ²-Bench (agentic tool use) | No data | 59.9% |
| MMMU-Pro (visual reasoning) | No data | 64.9% |
| Long-context reasoning (AA-LCR) | No data | 23.3% |
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-6.1 Terra Pro or Grok 4.20 Non-Reasoning?
Choose GPT-6.1 Terra Pro for reused prompts and documents (RAG, agents) and the latest release. Choose Grok 4.20 Non-Reasoning for high-volume, cost-sensitive work and writing and code generation.
Which is cheaper, GPT-6.1 Terra Pro or Grok 4.20 Non-Reasoning?
Grok 4.20 Non-Reasoning is 22% cheaper than GPT-6.1 Terra Pro at the headline price ($1.56 / 1M tokens vs $2.00 / 1M tokens).
Which has the larger context window, GPT-6.1 Terra Pro or Grok 4.20 Non-Reasoning?
GPT-6.1 Terra Pro reads more per request: 1.05M tokens against 1M.
What is the difference between GPT-6.1 Terra Pro and Grok 4.20 Non-Reasoning?
GPT-6.1 Terra Pro is made by OpenAI and Grok 4.20 Non-Reasoning by xAI. Grok 4.20 Non-Reasoning is 22% cheaper than GPT-6.1 Terra Pro at the headline price ($1.56 / 1M tokens vs $2.00 / 1M tokens). GPT-6.1 Terra Pro reads more per request: 1.05M tokens against 1M. GPT-6.1 Terra Pro is the newer model (Oct 26, 2026, against March 2026). Only GPT-6.1 Terra Pro offers reasoning. Only Grok 4.20 Non-Reasoning offers batch api.
How much do GPT-6.1 Terra Pro and Grok 4.20 Non-Reasoning cost per month?
At 20 million input and 5 million output tokens a month, GPT-6.1 Terra Pro costs $45.00 and Grok 4.20 Non-Reasoning costs $37.50, at standard rates.
Which is newer, GPT-6.1 Terra Pro or Grok 4.20 Non-Reasoning?
GPT-6.1 Terra Pro was released on Oct 26, 2026 and Grok 4.20 Non-Reasoning on March 2026.