Good for
- Prompts already tuned for it
Context window400,000 tokens
CategoryText
Credit rates
| Type | Credits | About |
|---|---|---|
| Inputper 1M tokens | 114,940 | HK$11.49 |
| Outputper 1M tokens | 689,640 | HK$68.96 |
10,000 credits = HK$1. Credits come with your monthly plan and each request is charged by what it uses. Every request is itemised under Usage in the console.
Which plans include it
| Plan | Included | Per month, roughly (messages) |
|---|---|---|
| Taster HK$28 | ✓ | ≈ 278 |
| Everyday HK$128 | ✓ | ≈ 1,114 |
| Advanced HK$288 | ✓ | ≈ 2,898 |
| Professional HK$588 | ✓ | ≈ 6,243 |
Monthly counts assume the whole month goes to this one use; chat, images and video share one credit pool. Compare plans →
How to use it
Through the API
Create an API key in the console, then call it by its model ID:
curl https://api.essevin.com/v1/chat/completions \
-H "Authorization: Bearer $ESSEVIN_API_KEY" \
-H "content-type: application/json" \
-d '{
"model": "gpt-5.5",
"messages": [{"role": "user", "content": "Hello"}]
}'More in this family
GPT-6.1 SolNewThe newest main GPT model and the most credit-efficient pick for daily chat and Codex.322 credits / messageGPT-6 SolThe previous Sol, priced like GPT-6.1 Sol and kept for existing workflows.322 credits / messageGPT-6 AstraNewThe top GPT-6 tier, for the hardest reasoning and analysis.1,610 credits / messageGPT-6 LunaNewThe light GPT-6 model: a few dozen credits a message, for high-volume simple tasks.17 credits / messageGPT-5.6 SolThe previous main GPT model, kept for existing workflows.897 credits / messageGPT-5.6 TerraThe previous mid-tier GPT model, kept for existing workflows.449 credits / message