Amazon Bedrock's OpenAI GPT-5.6 Sol has been reduced in price.
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Introduction
On August 21, 2026, AWS What's New announced a price reduction for OpenAI GPT-5.6 Sol on Amazon Bedrock. Following the price cuts for Terra / Luna on July 30, Sol is now the target of this round.
OpenAI's Announcement
OpenAI announced via its official X (formerly Twitter) account that API and credit pricing for GPT-5.6 Sol will be reduced by more than 20% over the next three months.
The new pricing is already in effect for the API, and will be rolled out gradually to ChatGPT Work and Codex credit-eligible plans. Note that there are no changes to Pro / Plus / Business subscription fees.
Price Reduction on Amazon Bedrock
The API price for Sol has been reduced to $4 per million input tokens and $20 per million output tokens. As with the Terra / Luna price cuts in July, Amazon Bedrock's standard unit prices have been aligned with OpenAI's official API prices. Usage on Bedrock counts toward existing AWS commitments. This promotional pricing is expected to be available until at least November 21, 2026.
The following is a before-and-after comparison of standard unit prices for Global CRIS (Short Context Window 272K) (USD per 1M tokens). With the Sol price reduction, all three GPT-5.6 models have now been repriced.
The prices before the revision are as follows.
| Model | Input | Output |
|---|---|---|
| GPT-5.6 Luna | $1.00 | $6.00 |
| GPT-5.6 Terra | $2.50 | $15.00 |
| GPT-5.6 Sol | $5.00 | $30.00 |
The prices after the revision are as follows.
| Model | Input | Output | 30-min Cache Write | Cache Read | Reduction Rate (Input) | Reduction Rate (Output) |
|---|---|---|---|---|---|---|
| GPT-5.6 Luna | $0.20 | $1.20 | $0.25 | $0.02 | 80% | 80% |
| GPT-5.6 Terra | $2.00 | $12.00 | $2.50 | $0.20 | 20% | 20% |
| GPT-5.6 Sol | $4.00 | $20.00 | $5.00 | $0.40 | 20% | 33.3% |
Sol is the top-tier model with higher input and output unit prices than Terra / Luna. It is intended for use cases such as autonomous coding agents, complex multi-step analysis, and advanced research. The input price reduction is the same 20% as Terra, but the output reduction is 33.3%, a larger cut than Terra's output reduction of 20% in July. While Sol has demonstrated strong performance on agent-based coding benchmarks, its high unit price had been a barrier to adoption, but this price cut makes it more accessible even for high-frequency workloads.
The Long Context Window (1M) carries higher unit prices; for example, Sol is $8.00 input / $30.00 output. In-Region / Geo CRIS pricing is approximately 10% higher than Global CRIS (e.g., Sol: $4.40 input / $22.00 output).
Price Comparison with the Claude 5 Generation
For reference, the following table compares the Claude 5 generation and the GPT-5.6 series available on Amazon Bedrock by price tier. Haiku 4.5, which falls in a similar price range, is also included for comparison (Global Cross-region Inference, USD per 1M tokens, input / output).
| Price Tier | GPT-5.6 | Claude |
|---|---|---|
| Low | Luna: $0.20 / $1.20 | Haiku 4.5: $1.00 / $5.00 |
| Mid | Terra: $2.00 / $12.00 | Sonnet 5: $2.00 / $10.00 |
| High | Sol: $4.00 / $20.00 | Opus 5: $5.00 / $25.00 |
| Top | (none) | Fable 5: $10.00 / $50.00 |
Luna is priced at one-fifth the input cost and one-quarter the output cost of Haiku 4.5, making it a notably affordable option within the GPT-5.6 series. Terra is in roughly the same price tier as Sonnet 5 (identical input price, with Sonnet 5 slightly cheaper on output), making it a direct comparison target. After the price cut, Sol is positioned 20% cheaper than Opus 5 on both input and output. There is currently no GPT-5.6 model in the price tier equivalent to the top-of-the-line Fable 5.
Summary
Following the July price cuts for Terra (20%) and Luna (80%), Sol—the top-tier model—was also reduced in price in August, meaning all three GPT-5.6 models have now undergone price revisions. In particular, the 33.3% reduction in output token pricing means that agent-oriented use cases with high output volumes stand to benefit the most.
Instructions on how to use GPT-5.6 Sol / Terra / Luna on Amazon Bedrock (bedrock-mantle) are introduced in the following article.
Additionally, with the update on August 17, 2026, GPT-5.6 (Sol / Terra / Luna) became available via the bedrock-runtime endpoint as well.
GPT-5.6 has become easier to integrate into existing workloads, and with the latest price reductions, it's even more accessible—please give it a try.
