The default model for most builds
Claude Sonnet 4.6 hits the sweet spot: fast enough for real-time apps, smart enough for genuinely hard tasks, and now cheap enough to run at scale. At $0.60/1M input it's the model most teams should default to for coding assistants, IDE integrations, and content generation.
Full price table
| Model | Input / 1M | Output / 1M |
|---|---|---|
| Claude Opus 4.6 | $15.00 → $3.00 | $75.00 → $15.00 |
| Claude Sonnet 4.6 | $3.00 → $0.60 | $15.00 → $3.00 |
| Claude Haiku 4.5 | $0.80 → $0.16 | $4.00 → $0.80 |
| GPT-5 | $2.50 → $0.50 | $10.00 → $2.00 |
| GPT-5.5 | $7.50 → $1.50 | $30.00 → $6.00 |
Strikethrough = official list price. Green = KissAPI price. No subscription, pay only for tokens you use.
Connect in one minute
curl https://api.kissapi.ai/v1/chat/completions \
-H "Authorization: Bearer $KISSAPI_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"MODEL_ID","messages":[{"role":"user","content":"hi"}]}'Use model id claude-sonnet-4-6.
Ship on Sonnet 4.6
Grab a key, get $1 free, and run Sonnet at 80% off list price.
Start Free — $1 creditFAQ
What does Claude Sonnet 4.6 cost here?
$0.60 per 1M input and $3.00 per 1M output, versus $3.00 / $15.00 official — about 80% off.
Is Sonnet 4.6 good enough for coding?
For most teams, yes. It's the recommended default for coding assistants and IDE tools, with Opus 4.6 reserved for the hardest problems.
Can I upgrade to Opus when needed?
Yes. Both models sit behind one key, so you can route the hard requests to Opus 4.6 and keep everything else on Sonnet.