Kiro's GPT-5.6 Luna credit multiplier is about 83% off. I checked the display after the Terra / Luna changes.
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Introduction
On August 1, 2026, the credit multipliers for GPT-5.6 Terra / Luna displayed in Kiro's model selection screen were updated. The display before and after the change is as follows. The reduction rate is a value calculated from the displayed multipliers.
| Model | Before | After | Reduction Rate |
|---|---|---|---|
gpt-5.6-terra |
1.20x credits | 1.00x credits | approx. 17% |
gpt-5.6-luna |
0.60x credits | 0.10x credits | approx. 83% |
GPT-5.6 Terra / Luna became available in Kiro on July 14, 2026, and this multiplier update came about half a month later. Regarding the price revision for GPT-5.6 Terra / Luna on Amazon Bedrock, an article was published the previous day. The price reduction on the Bedrock side concerns USD token unit pricing, which is a separate metric from the credit multipliers displayed on Kiro's model selection screen. This article covers Kiro's credit multipliers.
Verification Details
Confirming the Multiplier Change in the CLI Model Selection Screen
The model list displayed by /model in the Kiro CLI was checked before and after the change. Before the change, GPT-5.6 Terra / Luna were displayed as follows.
gpt-5.6-terra 1.20x credits
gpt-5.6-luna 0.60x credits
Terra changed from 1.20x to 1.00x, representing approximately a 17% reduction in the credit multiplier. Luna changed from 0.60x to 0.10x, a reduction of approximately 83%. Both values are calculated from the displayed multipliers.
Among the models displayed after the change, those with a credit multiplier of 1.00x or lower are as follows.
| Model | Credit Multiplier |
|---|---|
| auto | 1.00x |
gpt-5.6-terra |
1.00x (previously 1.20x) |
| glm-5 | 0.50x |
| claude-haiku-4.5 | 0.40x |
| deepseek-3.2 | 0.25x |
| minimax-m2.5 | 0.25x |
| minimax-m2.1 | 0.15x |
gpt-5.6-luna |
0.10x (previously 0.60x) |
| qwen3-coder-next | 0.05x |
Confirming the Update in the IDE Model Selection Screen
Not only in the CLI, but also in Kiro IDE's model selection screen, the updated multipliers for GPT-5.6 Terra / Luna could be confirmed.
Summary
GPT-5.6 Luna, whose credit multiplier has become 0.10x, is now a strong candidate for tasks in Kiro that do not require high performance. Using a high-multiplier model for simple tasks tends to result in greater credit consumption and longer processing times, so a practical approach is to try Luna first, and if the expected output is not obtained, switch to a higher-tier model such as Terra, Sol, Sonnet, or Opus. As an entry point for selecting models based on the task at hand rather than fixing a single model, Luna has become easy to try at its new multiplier.
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