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OpenAI’s GPT-5.6 Sol Price Cut: New API Rates, Coverage and Claude Comparison
OpenAI cut GPT 5.6 Sol’s standard short context API rates from $5 to $4 per million input tokens and from $30 to $20 per million output tokens for three months. The reduced Sol rate undercuts Claude Fable 5 by 60% on both token types and Claude Opus 5 by 20%, based on their listed standard API prices.
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Key takeaways
- OpenAI cut GPT 5.6 Sol’s standard short context API rates from $5 to $4 per million input tokens and from $30 to $20 per million output tokens for three months.
- The reduced Sol rate undercuts Claude Fable 5 by 60% on both token types and Claude Opus 5 by 20%, based on their listed standard API prices.
- The move follows earlier GPT 5.6 price cuts: Terra fell 20% and Luna fell 80%, while Sol’s standard pricing had previously remained unchanged.
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openai.comCreate a landscape editorial hero image for this Studio Global article: What pricing changes did OpenAI announce for developers using its frontier GPT-5.6 Sol model amid growing competition from Anthropic and Chi. Article summary: OpenAI announced a temporary, more-than-20% reduction in GPT-5.6 Sol pricing for developers for three months, amid intensifying competition from Anthropic and Chinese AI providers. The cut applies to API usage and eligib. Topic tags: general, news, general web, user generated. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks, charts w
OpenAI has temporarily reduced the developer price of its frontier GPT-5.6 Sol model by more than 20%, lowering the standard short-context API rate to $4 per million input tokens and $20 per million output tokens. The promotion is scheduled to run for three months and also covers eligible credits for ChatGPT Work and Codex. 1
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The timing puts Sol directly into a more aggressive pricing fight with Anthropic and Chinese AI providers. For developers, the immediate impact is lower pay-as-you-go inference costs—but the temporary nature of the offer matters when forecasting long-term infrastructure spend. 1
What changed in GPT-5.6 Sol pricing?
Before the promotion, Sol cost $5 per million input tokens and $30 per million output tokens for standard short-context use. The temporary rates are:
| GPT-5.6 Sol usage | Previous price | Promotional price |
|---|---|---|
| Input tokens, per 1 million | $5 | $4 |
| Output tokens, per 1 million | $30 | $20 |
The input price is reduced by 20%, while the output price falls by one-third. OpenAI describes the overall change as a reduction of more than 20%. 1
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This is a time-limited price reduction, not a confirmed permanent change to Sol’s underlying list price. OpenAI’s announcement says the lower API and credit pricing applies for the next three months. 15
Which products and plans are covered?
The discount applies in two main areas:
- OpenAI’s API, where developers pay according to token usage.
- Eligible credits for ChatGPT Work and Codex, including credit-based use of OpenAI’s agentic and coding products.
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The available reporting distinguishes these API and credit changes from the regular ChatGPT subscription tiers. Standard Plus, Pro and Business subscription pricing is reported as unchanged, although the primary announcement excerpt does not provide a detailed breakdown of how included usage is calculated for each plan. Treat the subscription exclusion as a distinction between pricing categories rather than as evidence that every plan limit or allowance is identical. 20
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How Sol compares with Anthropic’s Claude models
Anthropic lists Claude Fable 5 at $10 per million input tokens and $50 per million output tokens. Its Claude Opus 5 rate is $5 per million input tokens and $25 per million output tokens. 31
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| Model | Input price per 1M tokens | Output price per 1M tokens |
|---|---|---|
| GPT-5.6 Sol, temporary rate | $4 | $20 |
| Claude Opus 5 | $5 | $25 |
| Claude Fable 5 | $10 | $50 |
At the promotional rate, GPT-5.6 Sol is:
- 20% cheaper than Claude Opus 5 for both input and output tokens.
- 60% cheaper than Claude Fable 5 for both input and output tokens.
These are like-for-like comparisons of the listed standard per-token rates. Actual bills can also depend on factors such as caching, context length, batch processing and the number of input versus output tokens a workload generates.
Earlier GPT-5.6 price cuts
Sol’s discount follows two permanent-looking list-price reductions for the lower GPT-5.6 tiers announced on July 30:
- GPT-5.6 Terra fell 20%, from $2.50 to $2 per million input tokens and from $15 to $12 per million output tokens.
- GPT-5.6 Luna fell 80%, from $1 to $0.20 per million input tokens and from $6 to $1.20 per million output tokens.
OpenAI’s July announcement said Sol’s standard pricing remained unchanged at that point. 12
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What the change means for developers
The main benefit is straightforward: teams using Sol through the API or eligible Work and Codex credits can run the same model at a lower token cost during the promotional window. The output-token reduction is especially significant for applications that generate long answers, code or multi-step agent responses.
The caveat is budgeting. Because OpenAI announced the Sol reduction for three months rather than as a permanent list-price revision, teams should model both the discounted rate and the possibility of a return to the earlier $5/$30 pricing after the promotion. The cut improves Sol’s near-term price position against Claude Opus 5 and Fable 5, but it does not by itself establish which model delivers the lowest cost per completed task or the best performance for a particular workload.
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What is the short answer to "OpenAI’s GPT-5.6 Sol Price Cut: New API Rates, Coverage and Claude Comparison"?
OpenAI cut GPT 5.6 Sol’s standard short context API rates from $5 to $4 per million input tokens and from $30 to $20 per million output tokens for three months.
What are the key points to validate first?
OpenAI cut GPT 5.6 Sol’s standard short context API rates from $5 to $4 per million input tokens and from $30 to $20 per million output tokens for three months. The reduced Sol rate undercuts Claude Fable 5 by 60% on both token types and Claude Opus 5 by 20%, based on their listed standard API prices.
What should I do next in practice?
The move follows earlier GPT 5.6 price cuts: Terra fell 20% and Luna fell 80%, while Sol’s standard pricing had previously remained unchanged.