High-volume, cost-sensitive work
Choose GPT-4.1
GPT-4.1 costs 13% less on a typical mix of three input tokens for every output token ($3.50 against $4.00 per million tokens).
GPT-4.1 vs Kimi K3.1 Pro: price, context and capabilities
Choose GPT-4.1 for high-volume, cost-sensitive work and writing and code generation. Choose Kimi K3.1 Pro for reused prompts and documents (RAG, agents) and the latest release.
In short
- GPT-4.1 is 13% cheaper than Kimi K3.1 Pro at the headline price ($3.50 / 1M tokens vs $4.00 / 1M tokens).
- Kimi K3.1 Pro reads more per request: 1.05M tokens against 1.05M.
- Kimi K3.1 Pro is the newer model (Oct 23, 2026, against Apr 14, 2025).
- Only GPT-4.1 offers batch api.
- Only Kimi K3.1 Pro offers reasoning.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose GPT-4.1
GPT-4.1 charges $8.00 per million output tokens, against $10.00 for Kimi K3.1 Pro. Output dominates the bill when answers are long.
Reused prompts and documents (RAG, agents)
Choose Kimi K3.1 Pro
Kimi K3.1 Pro charges $0.20 per million cached input tokens, against $0.50 for GPT-4.1.
Latest release
Choose Kimi K3.1 Pro
Kimi K3.1 Pro is the newer release (Oct 23, 2026, against Apr 14, 2025 for GPT-4.1).
Monthly cost at three volumes
| Volume | GPT-4.1 | Kimi K3.1 Pro | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $4.00 | $4.50 | GPT-4.1, $0.50 less |
| Production: 20M input, 5M output tokens | $80.00 | $90.00 | GPT-4.1, $10.00 less |
| Scale: 500M input, 100M output tokens | $1,800 | $2,000 | GPT-4.1, $200.00 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| GPT-4.1 | Kimi K3.1 Pro | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Category | Language models | Language models |
| Status | Deprecated | Generally available |
| Headline price | $3.50 / 1M tokens | $4.00 / 1M tokens |
| Input | $2.00 / 1M tokens | $2.00 / 1M tokens |
| Output | $8.00 / 1M tokens | $10.00 / 1M tokens |
| Cached input | $0.50 / 1M tokens | $0.20 / 1M tokens |
| Context window | 1.05M | 1.05M |
| Max output | 33k | 944k |
| Released | Apr 14, 2025 | Oct 23, 2026 |
| Knowledge cutoff | June 2024 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching |
| API model id | gpt-4.1 | kimi-k3.1-pro |
Benchmarks side by side
Leader in bold.
| Benchmark | GPT-4.1 | Kimi K3.1 Pro |
|---|---|---|
| Terminal-Bench Hard | 13.6% | No data |
| GPQA Diamond | 66.6% | No data |
| Humanity's Last Exam | 4.2% | No data |
| IFBench (instruction following) | 43% | No data |
| τ²-Bench (agentic tool use) | 47.1% | No data |
| MMMU-Pro (visual reasoning) | 61.2% | No data |
| Long-context reasoning (AA-LCR) | 68.3% | 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-4.1 or Kimi K3.1 Pro?
Choose GPT-4.1 for high-volume, cost-sensitive work and writing and code generation. Choose Kimi K3.1 Pro for reused prompts and documents (RAG, agents) and the latest release.
Which is cheaper, GPT-4.1 or Kimi K3.1 Pro?
GPT-4.1 is 13% cheaper than Kimi K3.1 Pro at the headline price ($3.50 / 1M tokens vs $4.00 / 1M tokens).
Which has the larger context window, GPT-4.1 or Kimi K3.1 Pro?
Kimi K3.1 Pro reads more per request: 1.05M tokens against 1.05M.
What is the difference between GPT-4.1 and Kimi K3.1 Pro?
GPT-4.1 is made by OpenAI and Kimi K3.1 Pro by Moonshot AI. GPT-4.1 is 13% cheaper than Kimi K3.1 Pro at the headline price ($3.50 / 1M tokens vs $4.00 / 1M tokens). Kimi K3.1 Pro reads more per request: 1.05M tokens against 1.05M. Kimi K3.1 Pro is the newer model (Oct 23, 2026, against Apr 14, 2025). Only GPT-4.1 offers batch api. Only Kimi K3.1 Pro offers reasoning.
How much do GPT-4.1 and Kimi K3.1 Pro cost per month?
At 20 million input and 5 million output tokens a month, GPT-4.1 costs $80.00 and Kimi K3.1 Pro costs $90.00, at standard rates.
Which is newer, GPT-4.1 or Kimi K3.1 Pro?
Kimi K3.1 Pro was released on Oct 23, 2026 and GPT-4.1 on Apr 14, 2025.