OpenAI vs Moonshot AI Kimi — API Comparison
Head-to-head comparison of pricing, features, and use case fit. Updated November 5, 2026.
⚡ Verdict: OpenAI wins on ecosystem; Kimi wins on 128K context and Chinese tasks.
💰 Pricing Comparison
| Metric | OpenAI | Moonshot AI Kimi |
|---|---|---|
| Input Price | GPT-6 Astra: $10/M input + $50/M output (1.05M context, cache $1/$12.50, Fast 2x, Batch 50%); GPT-6.1 Sol: $2/M input + $10/M output Standard (1.05M context); GPT-6.1 Terra: $1/M input + $5/M output Standard, $0.50/$2.50 Batch (1.05M context, >272K input = 2x input / 1.5x output); GPT-5.6 Sol: $4/$20 Standard, $2/$10 Batch (promo through Nov 21, 2026); GPT-5: $1.25/$10, GPT-5 mini: $0.25/$2, GPT-4o: $2.50/$10, GPT-4o mini: $0.15/$0.60 | K3.1 Pro: ¥13/M 未命中、¥1.30/M 缓存命中；Highspeed ¥26/M；K3: ¥20/M、¥2/M 缓存；K2.7/K2.6: ¥6.50/M |
| Output Price | Batch/Flex API for all models: 50% discount; long-context (>272K input): 2x Standard tier; Fast mode: 2x applicable rates; cache writes 1.25x input | K3.1 Pro: ¥68/M；Highspeed ¥136/M；K3: ¥100/M；K2.7/K2.6: ¥27/M |
| China Access | ❌ Proxy required (export control restrictions for China users) | ✅ Direct access intended for Mainland China |
| Free Tier | New accounts receive $5 in credits valid for 3 months | New-user credit cannot be spent on the K3 series; K3 models unlock after a minimum $1 top-up, with rate-limit tiers set by cumulative recharge |
| Models | 14+ | 5+ |
| Overall Rank | #1 | #9 |
🤖 Supported Models
OpenAI
Moonshot AI Kimi
✨ Pros
OpenAI
- ✓ Reference implementation of the OpenAI Chat Completions API; every 'OpenAI-compatible' third-party provider targets parity with this surface.
- ✓ GPT-5.6 Sol cut to $4/$20 Standard on August 22, 2026 — promotional through at least November 21, 2026; Batch tier effectively $2/$10.
- ✓ GPT-5.6 family has three SKUs (Sol frontier $4/$20, Terra mid $2/$12, Luna efficient $0.20/$1.20) for capability-tiered workloads.
- ✓ First-party support for function calling, structured outputs (JSON schema), streaming (SSE), Realtime voice, vision (images + PDFs), and async Batch API at 50% off.
- ✓ Chat Completions / Responses / Assistants / Realtime / Images / Audio / Embeddings — seven distinct API surfaces for different workloads.
- ✓ Enterprise tier ships SOC 2 Type II + ISO 27001 + HIPAA eligibility + Zero Data Retention + EU data residency + admin SSO + audit log API.
- ✓ $5 in free credits for new accounts, valid for 3 months; org-wide rate limits visible in dashboard; per-key usage telemetry on every model.
Moonshot AI Kimi
- ✓ Kimi K3.1 Pro: 3T-class open-weight flagship, 1M-token context, native vision; vendor reports 65.7% on Terminal-Bench 4.0
- ✓ K3 series supports low/high/max reasoning_effort, tool calls, tool_choice, dynamic tools, and JSON Schema
- ✓ Cache hits at 10% of input price for repository-scale agents; Batch API at 60% of standard rate
- ✓ K3.1 Pro Highspeed is the same model at ~2-3x speed; K2.7 Code/K2.6 are the 256K budget options (retiring end of 2026)
⚠️ Cons
OpenAI
- × Higher API costs (o1 series $15-60/M)
- × China requires proxy for access
- × Frequent output model updates, occasional API compatibility issues
- × High token consumption, especially o1 series
- × No special discounts beyond batch credits
Moonshot AI Kimi
- × The K3 series always reasons; there is no no-thinking mode
- × Highspeed output is expensive (CNY 136 / $20 per 1M)
- × K3 models require a top-up to unlock; new-user credit is not eligible
- × Official docs flag web search as still being upgraded; use cautiously in production
🎯 Best For
OpenAI
Production workloads requiring industry benchmark quality; Function Calling/Structured Output; multimodal applications
Moonshot AI Kimi
China-based developers needing 1M context, vision, and long-running agents; long documents and repository-scale coding
❓ FAQ
Which is cheaper, OpenAI or Moonshot AI Kimi? ▼
OpenAI — Input: GPT-6 Astra: $10/M input + $50/M output (1.05M context, cache $1/$12.50, Fast 2x, Batch 50%); GPT-6.1 Sol: $2/M input + $10/M output Standard (1.05M context); GPT-6.1 Terra: $1/M input + $5/M output Standard, $0.50/$2.50 Batch (1.05M context, >272K input = 2x input / 1.5x output); GPT-5.6 Sol: $4/$20 Standard, $2/$10 Batch (promo through Nov 21, 2026); GPT-5: $1.25/$10, GPT-5 mini: $0.25/$2, GPT-4o: $2.50/$10, GPT-4o mini: $0.15/$0.60, Output: Batch/Flex API for all models: 50% discount; long-context (>272K input): 2x Standard tier; Fast mode: 2x applicable rates; cache writes 1.25x input. Moonshot AI Kimi — Input: K3.1 Pro: ¥13/M 未命中、¥1.30/M 缓存命中；Highspeed ¥26/M；K3: ¥20/M、¥2/M 缓存；K2.7/K2.6: ¥6.50/M, Output: K3.1 Pro: ¥68/M；Highspeed ¥136/M；K3: ¥100/M；K2.7/K2.6: ¥27/M.
Which is better for China access? ▼
OpenAI: ❌ Proxy required (export control restrictions for China users). Moonshot AI Kimi: ✅ Direct access intended for Mainland China.
What is the overall verdict? ▼
OpenAI wins on ecosystem; Kimi wins on 128K context and Chinese tasks.