Which is cheaper, Kimi K3 or GPT-5 mini?

Kimi K3 is cheaper at the input + output rate combined: $1.50 versus $2.25 per million tokens.

Which has higher quality, Kimi K3 or GPT-5 mini?

GPT-5 mini has the higher AA Intelligence Index score: 84 versus 80.

Can I switch between Kimi K3 and GPT-5 mini via one API?

Both Kimi K3 and GPT-5 mini are accessible through OpenRouter's unified gateway, which lets you switch models with one API key. Phase 2 of AIpricly will add scenario-routed automatic primary + fallback chains.

Kimi K3 vs GPT-5 mini

Side-by-side pricing, capabilities, real-world cost across common scenarios, and our editorial pick.

Add a modelUp to 4 models can be compared

all prices in USD per 1M tokens

Kimi K3

Moonshot · released 2026-03-15

Quality (AA Index)80

Input price$0.30

Output price$1.20

Context200K

Throughput150 tok/s

P50 latency0.8s

View full pricing

OVERALL WINNER

GPT-5 mini

OpenAI · released 2026-01-15

Quality (AA Index)84

Input price$0.25

Output price$2.00

Context400K

Throughput280 tok/s

P50 latency0.3s

View full pricing

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Head-to-head specs

Green column = winner per metric

Metric	Kimi K3	GPT-5 mini	Verdict
Input price /1M tokens	$0.30	$0.25	GPT-5 mini −17%
Output price /1M tokens	$1.20	$2.00	Kimi K3 −40%
Context window max input length	200K	400K	GPT-5 mini +2.0×
AA Quality AA Intelligence Index (0–100)	80	84	GPT-5 mini +4pt
Arena Elo LMArena human-pref Elo (800–2000)	—	—	Tied
Throughput tokens per second	150	280	GPT-5 mini +87%
P50 latency first token	0.8s	0.3s	GPT-5 mini −63%
Vision multimodal	—
Function calling tool use			Tied
Reasoning mode chain-of-thought	—

Monthly cost across common scenarios

Default usage assumptions

Scenario	Kimi K3	GPT-5 mini
customer support 1000K req · 600/180 tok	$396	$510
chat with docs 300K req · 4000/300 tok	$468	$480
code generation 500K req · 2000/500 tok	$600	$750
voice assistant 600K req · 800/200 tok	$288	$360

Our pick

For most workloads, choose GPT-5 mini.

17% cheaper input price, which compounds at scale
2.0× the context window — better for long documents and agents
87% faster throughput — matters for streaming UX and voice agents

GPT-5 family inheritance at a fraction of the cost — strong on routine tasks but visibly weaker on multi-step reasoning. Default choice when GPT-5 is overkill.

Choose Kimi K3 instead if: Tradeoffs for this pair have not yet been documented. The quality difference may be small enough that workload fit, integration cost, and team familiarity decide the choice.

Read our deep analysis

The Cheapest LLM API for Production in 2026

Why pick? Use both with smart routing

Phase 2 · gateway with fallback chain

Set GPT-5 mini as primary, Kimi K3 as fallback. One key, one bill, automatic failover when GPT-5 mini errors.

PHASE 2 PREVIEW · gateway not live yetThis endpoint does not exist yet. The gateway is in Phase 2 — what you see below is a design preview of the planned interface, not a live API. We will email subscribers when it launches.

Preview the planned API call

$ curl https://api.aipricly.com/v1/chat/completions \
  -H "Authorization: Bearer $AIPC_KEY" \
  -d '{
    "routing": {
      "primary": "openai/gpt-5-mini",
      "fallback": ["moonshot/kimi-k3"]
    },
    "messages": [{"role": "user", "content": "..."}]
  }'