
GPT-6 Astra and Claude Fable 5.1 on xKiro — vision, tools and a 1M-token context
Two frontier models for deep research, coding and long agentic runs. Vision, tools, 1M context and five reasoning levels.
Ended Aug 19, 2026
This offer has ended.
Standard pricing applies again. See the offers running now

This promotion ran through 8 August 2026 and has now ended; GPT and Claude models are billed at standard rates again. The full GPT family and Anthropic Claude models remain available on xKiro through the same OpenAI- and Anthropic-compatible endpoints, and several other models are free — see the current offers.
Current list prices per 1M tokens, read live from the model catalog.
| Model | Context | Input | Output |
|---|---|---|---|
GPT-5.6 Terraopenai/gpt-5.6-terra · 1M | 1M | $1 | $6 |
openai/gpt-5.5Not in the current catalog | — | — | — |
Opus 5anthropic/claude-opus-5 · 1M | 1M | $5 | $25 |
Sonnet 5anthropic/claude-sonnet-5 · 1M | 1M | $2 | $10 |
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Every offer applies on every request through the same OpenAI- and Anthropic-compatible API. 45 models are free with an account.
No credit card · Cancel anytime · 45 free models, free forever