High-volume, cost-sensitive work
Choose Kimi K3.1 Pro
Kimi K3.1 Pro costs 11% less on a typical mix of three input tokens for every output token ($4.00 against $4.50 per million tokens).
GPT-5.6 Terra vs Kimi K3.1 Pro: price, context and capabilities
Choose Kimi K3.1 Pro for high-volume, cost-sensitive work, writing and code generation and the latest release; on the other points the two are level or the data is missing.
In short
- Kimi K3.1 Pro is 11% cheaper than GPT-5.6 Terra at the headline price ($4.00 / 1M tokens vs $4.50 / 1M tokens).
- GPT-5.6 Terra reads more per request: 1.05M tokens against 1.05M.
- Kimi K3.1 Pro is the newer model (Oct 23, 2026, against Jul 9, 2026).
- Only GPT-5.6 Terra 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 Kimi K3.1 Pro
Kimi K3.1 Pro charges $10.00 per million output tokens, against $12.00 for GPT-5.6 Terra. Output dominates the bill when answers are long.
Latest release
Choose Kimi K3.1 Pro
Kimi K3.1 Pro is the newer release (Oct 23, 2026, against Jul 9, 2026 for GPT-5.6 Terra).
Monthly cost at three volumes
| Volume | GPT-5.6 Terra | Kimi K3.1 Pro | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $5.00 | $4.50 | Kimi K3.1 Pro, $0.50 less |
| Production: 20M input, 5M output tokens | $100.00 | $90.00 | Kimi K3.1 Pro, $10.00 less |
| Scale: 500M input, 100M output tokens | $2,200 | $2,000 | Kimi K3.1 Pro, $200.00 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| GPT-5.6 Terra | Kimi K3.1 Pro | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $4.50 / 1M tokens | $4.00 / 1M tokens |
| Input | $2.00 / 1M tokens | $2.00 / 1M tokens |
| Output | $12.00 / 1M tokens | $10.00 / 1M tokens |
| Cached input | $0.20 / 1M tokens | $0.20 / 1M tokens |
| Context window | 1.05M | 1.05M |
| Max output | 128k | 944k |
| Released | Jul 9, 2026 | Oct 23, 2026 |
| Knowledge cutoff | February 2026 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching |
| API model id | gpt-5.6-terra | kimi-k3.1-pro |
Benchmarks side by side
Leader in bold.
| Benchmark | GPT-5.6 Terra | Kimi K3.1 Pro |
|---|---|---|
| Intelligence Index | 42.1 | No data |
| Terminal-Bench Hard | 57.6% | No data |
| SciCode | 55% | No data |
| GPQA Diamond | 92.5% | No data |
| Humanity's Last Exam | 42.9% | No data |
| IFBench (instruction following) | 71.2% | No data |
| τ²-Bench (agentic tool use) | 86.3% | No data |
| MMMU-Pro (visual reasoning) | 80.7% | No data |
| Long-context reasoning (AA-LCR) | 83% | No data |
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-5.6 Terra or Kimi K3.1 Pro?
Choose Kimi K3.1 Pro for high-volume, cost-sensitive work, writing and code generation and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, GPT-5.6 Terra or Kimi K3.1 Pro?
Kimi K3.1 Pro is 11% cheaper than GPT-5.6 Terra at the headline price ($4.00 / 1M tokens vs $4.50 / 1M tokens).
Which has the larger context window, GPT-5.6 Terra or Kimi K3.1 Pro?
GPT-5.6 Terra reads more per request: 1.05M tokens against 1.05M.
What is the difference between GPT-5.6 Terra and Kimi K3.1 Pro?
GPT-5.6 Terra is made by OpenAI and Kimi K3.1 Pro by Moonshot AI. Kimi K3.1 Pro is 11% cheaper than GPT-5.6 Terra at the headline price ($4.00 / 1M tokens vs $4.50 / 1M tokens). GPT-5.6 Terra reads more per request: 1.05M tokens against 1.05M. Kimi K3.1 Pro is the newer model (Oct 23, 2026, against Jul 9, 2026). Only GPT-5.6 Terra offers batch api.
How much do GPT-5.6 Terra and Kimi K3.1 Pro cost per month?
At 20 million input and 5 million output tokens a month, GPT-5.6 Terra costs $100.00 and Kimi K3.1 Pro costs $90.00, at standard rates.
Which is newer, GPT-5.6 Terra or Kimi K3.1 Pro?
Kimi K3.1 Pro was released on Oct 23, 2026 and GPT-5.6 Terra on Jul 9, 2026.