API cost decision in 10 seconds

KAT-Coder-Pro V2.5 vs GPT-5.6 Luna Pro

Pick GPT-5.6 Luna Pro when budget and context both matter.

Page updated:  Data confirmed:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output

Budget verdict

Pick GPT-5.6 Luna Pro when budget and context both matter.

On the standard 1M input plus 500K output workload, GPT-5.6 Luna Pro is estimated at $0.8 vs $2.22 for KAT-Coder-Pro V2.5, saving $1.42 (64% lower).

Cost-first pickGPT-5.6 Luna Pro
Context-first pickGPT-5.6 Luna Pro
Sample savings$1.4264%
10x traffic gap$14.2

GPT-5.6 Luna Pro is cheaper on the standard workload and also has the larger context window. At 10x that traffic, the same price gap is about $14.2. Use the calculator below to replace the sample workload with your own token volume.

Cost sensitivity

Workload Sensitivity

Same prices, different token mixes.

GPT-5.6 Luna Pro stays cheaper across input-heavy, balanced, and output-heavy sample workloads.

Workload shapeToken mixBetter pickKAT-Coder-Pro V2.5GPT-5.6 Luna Pro
Input-heavy / RAG5M input + 500K outputGPT-5.6 Luna Pro$5.18$1.6
Balanced workload1M input + 1M outputGPT-5.6 Luna Pro$3.7$1.4
Output-heavy chatbot1M input + 5M outputGPT-5.6 Luna Pro$15.54$6.2
Cheaper input GPT-5.6 Luna Pro $0.74 vs $0.2 / 1M

GPT-5.6 Luna Pro is $0.54 cheaper per 1M input tokens (73% lower; 3.7x difference).

Cheaper output GPT-5.6 Luna Pro $2.96 vs $1.2 / 1M

GPT-5.6 Luna Pro is $1.76 cheaper per 1M output tokens (59.5% lower; 2.47x difference).

Larger context GPT-5.6 Luna Pro 256K vs 1.05M

GPT-5.6 Luna Pro has 794K more context (4.1x larger).

Sample workload GPT-5.6 Luna Pro $2.22 vs $0.8

GPT-5.6 Luna Pro is $1.42 cheaper on the standard workload (64% lower).

Estimate your workload cost

Your Workload Cost

Prices are normalized to USD per 1M tokens.
KAT-Coder-Pro V2.5 Calculating… Estimated API cost
GPT-5.6 Luna Pro Calculating… Estimated API cost
Cheaper for this workload Calculating… Difference: calculating…

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Quick Decision

Verdict

GPT-5.6 Luna Pro has the lower input price; GPT-5.6 Luna Pro has the lower output price; GPT-5.6 Luna Pro offers the larger context window. For the 1M input plus 500K output sample, GPT-5.6 Luna Pro is cheaper for the standard workload.

For a 1M input token plus 500K output token workload, the estimated API cost is $2.22 for KAT-Coder-Pro V2.5 and $0.8 for GPT-5.6 Luna Pro.

Best Fit

Choose KAT-Coder-Pro V2.5 when its provider, model quality, latency, or availability is more important than the numeric price/context winner.

Choose GPT-5.6 Luna Pro when you care most about lower input-token price, lower output-token price, and larger context window.

Decision Notes
  • On the standard 1M input plus 500K output workload, GPT-5.6 Luna Pro is estimated at $0.8 vs $2.22 for KAT-Coder-Pro V2.5, saving $1.42 (64% lower).
  • GPT-5.6 Luna Pro is $1.42 cheaper on the standard workload (64% lower).
  • GPT-5.6 Luna Pro is $0.54 cheaper per 1M input tokens (73% lower; 3.7x difference).
  • GPT-5.6 Luna Pro is $1.76 cheaper per 1M output tokens (59.5% lower; 2.47x difference).
  • GPT-5.6 Luna Pro has 794K more context (4.1x larger).
Head-to-Head Specs
FeatureKAT-Coder-Pro V2.5
(Kwaipilot)		GPT-5.6 Luna Pro
(OpenAI)
Input Price
prompt tokens per 1M		$0.74$0.2
Completion Price
per 1M tokens		$2.96$1.2
Sample Workload Cost
1M input + 500K output		$2.22$0.8
Context Window256K1.05M
Release Date

Use-Case Decision Matrix

Use caseBetter pickWhy
Budget-constrained productionGPT-5.6 Luna ProOn the standard 1M input plus 500K output workload, GPT-5.6 Luna Pro is estimated at $0.8 vs $2.22 for KAT-Coder-Pro V2.5, saving $1.42 (64% lower).
High-volume input processingGPT-5.6 Luna ProLower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill.
Long responses and chatbotsGPT-5.6 Luna ProLower output-token price matters most when assistants generate many completion tokens.
RAG or long-document workGPT-5.6 Luna ProA larger context window leaves more room for retrieved passages, conversation history, or source files.

Related Alternatives

Same-provider lower-cost swaps
  • KAT-Coder-Air V2.5 can replace KAT-Coder-Pro V2.5 when lower sample workload cost matters most: $0.45.
  • KAT-Coder-Pro V2 can replace KAT-Coder-Pro V2.5 when lower sample workload cost matters most: $0.9.
  • gpt-oss-120b (free) can replace GPT-5.6 Luna Pro when lower sample workload cost matters most: $0.
  • gpt-oss-20b (free) can replace GPT-5.6 Luna Pro when lower sample workload cost matters most: $0.

Cheaper alternatives

Review low-cost models sorted by a standard 1M input plus 500K output workload.

Open cheapest models

Larger context alternatives

Find models with larger context windows for RAG, long documents, and codebase review.

Open largest context models

Provider catalogs

Compare models within provider hubs before choosing a final API vendor.

Open provider hubs

Kwaipilot catalog

Review all tracked Kwaipilot models before deciding whether this matchup is the right shortlist.

Open Kwaipilot models

OpenAI catalog

Check other OpenAI models with comparable pricing, context, or release timing.

Open OpenAI models
KAT-Coder-Pro V2.5

KAT-Coder-Pro V2.5 is a flagship-level Agentic Coding model that can directly hand over an entire issue or an entire business workflow to it, allowing it to autonomously locate and make...

GPT-5.6 Luna Pro

GPT-5.6 Luna Pro is the same underlying model as [GPT-5.6 Luna](https://openrouter.ai/openai/gpt-5.6-luna), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode