GPT-6 Astra · Writing
GPT-6 Astra for writing: our test runs
GPT-6 Astra ran our 5 writing prompts in llmwise, through the same pipeline your messages take. Here's every reply as it came, whether it passed, what it cost and what it counts as on Pro, next to the other models.
Based on 5 of our test runs on , through OpenRouter with the app's own prompt and settings.
Short answer
In our test runs on September 27, 2026, GPT-6 Astra passed 5 of 5 of our writing prompts (both hard ones): tied 1st of 15 models. Each reply counted as 1 message on Pro, where it has 31 a month, and cost $0.0111 to run on average.
Prompt by prompt
Each of the 5 writing prompts, and how GPT-6 Astra's reply did.
| Prompt | Result | Cost | Time |
|---|---|---|---|
| Announce a second bakery shop on LinkedInEveryday | Passed: Graded 4.5 of 5 on average (lowest 4). | $0.0111 | 4.8 s |
| Rewrite corporate jargon in plain wordsEveryday | Passed: Graded 4.0 of 5 on average (lowest 4). | $0.0145 | 6.0 s |
| Decline a meeting and offer two timesEveryday | Passed: Graded 5.0 of 5 on average (lowest 5). | $0.0079 | 3.3 s |
| A product announcement with five rulesHard | Passed: Graded 4.3 of 5 on average (lowest 4). | $0.0084 | 3.3 s |
| Argue both sides of free busesHard | Passed: Graded 4.7 of 5 on average (lowest 4). | $0.0137 | 7.2 s |
Every writing reply from GPT-6 Astra
Announce a second bakery shop on LinkedIn
An everyday prompt: “Announce a second bakery shop on LinkedIn”, in full.
Passed: Graded 4.5 of 5 on average (lowest 4).
We’ve got some lovely news: Crumb & Co. is opening a second shop in Leeds on 14 November. As a small bakery, this is a big step for us. We’re grateful to everyone who has stopped by for a loaf, picked up a treat, or told a friend about us. Your support has helped make this possible. We’re looking forward to meeting our new neighbours and welcoming familiar faces through the door. To celebrate, we’ll be offering free coffee on opening day. Come and say hello, have a look around, and enjoy a cup on us. Thank you for being part of Crumb & Co. We can’t wait to welcome you to our second home.
389 tokens in, 144 out · 4.8 s · $0.0111 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·
Rewrite corporate jargon in plain words
An everyday prompt: “Rewrite corporate jargon in plain words”, in full.
Passed: Graded 4.0 of 5 on average (lowest 4).
In Q3, teams across departments worked together to shift toward a more customer-focused approach. Among enterprise customers, the initiative increased retention by 12% and reduced the rate at which customers leave by 0.3 percentage points (30 basis points). We also adjusted customer interactions across all channels to make better use of available capacity.
417 tokens in, 206 out (134 of them reasoning) · 6.0 s · $0.0145 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·
Decline a meeting and offer two times
An everyday prompt: “Decline a meeting and offer two times”, in full.
Passed: Graded 5.0 of 5 on average (lowest 5).
Subject: Vendor Demo – Alternative Times Hi Tom, Thank you for the invitation to the vendor demo. Unfortunately, I’m presenting to the board on Wednesday at 11:00, so I won’t be able to attend then. Would Thursday at 10:00 or Friday at 14:00 work instead? Thanks for your flexibility. Best, [Your Name]
395 tokens in, 79 out · 3.3 s · $0.0079 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·
A product announcement with five rules
A hard prompt: “A product announcement with five rules”, in full.
Passed: Graded 4.3 of 5 on average (lowest 4).
Meet the Nordvik 2, a desk lamp that puts light where you need it. Choose from five dimming steps, turn the arm 270 degrees to find your angle, and charge it via USB-C. Priced at €79 and shipping on 1 December, the Nordvik 2 is ready for your next chapter, sketch or late-night idea. Ready to see your desk in a new light?
406 tokens in, 87 out · 3.3 s · $0.0084 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·
Argue both sides of free buses
A hard prompt: “Argue both sides of free buses”, in full.
Passed: Graded 4.7 of 5 on average (lowest 4).
A city should make its buses free because mobility is a gateway to work, education, and healthcare—not a privilege reserved for those who can afford each trip. Eliminating fares delivers immediate relief to low-income households, speeds boarding, and removes costly fare enforcement. Funded through progressive taxation, free buses spread the cost fairly while making public transport an easier choice. A city already pays for streets everyone can use; it should support shared travel that uses those streets more efficiently. But a free bus that arrives late—or never comes—is no bargain. Cities should spend scarce transit funding on frequent, reliable service before subsidizing every rider, including those who can comfortably pay. Lost fare revenue must come from higher taxes, other public services, or the transit budget itself. Targeted discounts can protect people who need help without sacrificing coverage and capacity. To persuade drivers to switch, buses must compete on convenience and reliability, not merely price; better service may deliver greater social and environmental benefits.
384 tokens in, 197 out · 7.2 s · $0.0137 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·
How it compares on writing
GPT-6 Astra beside the job's picks among every model. 2 models share the hard-problems pick, GPT-6 Astra among them.
| Model | Passed | On Pro | Cost per reply |
|---|---|---|---|
| GLM 5.3Our pick: best value | 4 of 5 | 250 a month on Pro | $0.0006 |
| GPT-6 LunaOur pick: hard problems (shared), everyday | 5 of 5 | 60 a day on Pro | $0.0001 |
| GPT-6 AstraOur pick: hard problems (shared) | 5 of 5 | 31 a month on Pro | $0.0111 |
Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.
How these runs were done
Rubric (graded). The grader model scores the reply from 1 to 5 on each published criterion. It passes with an average of 4 or more and no criterion under 3, and only if it also meets the prompt's automatic rules (length, words it must or mustn't use).
The grader is Claude Opus 5.5 at low reasoning effort; its own replies are graded by GPT-6 Astra, so no model grades itself. Its prompt and every rubric are on the methods page.
GPT-6 Astra, and writing, elsewhere
- GPT-6 Astra: price, limits and messages on every plan
- The best AI for writing: our picks among every model
- GPT-6 for writing
- GPT-6 Astra for coding: our test runs
- GPT-6 Astra for math: our test runs
- GPT-6 Astra for data analysis: our test runs
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Opus 5.5 vs GPT-6 Astra
- GPT-6 Astra vs GPT-6 Sol
- GPT-6 Astra vs Grok 4.7
- Rewrite for clarity: the prompt, and its price on each model
- Our test runs: 50 prompts on every model
Questions
Is GPT-6 Astra good for writing?
In our test runs it passed 5 of 5 writing prompts, tied 1st of the 15 models in llmwise. Every reply is on this page, so you can judge them yourself.
How many of my messages does a writing reply from GPT-6 Astra use?
1 message each on Pro, where it has 31 a month on Pro. The price of a message is fixed and shown before you send it, however long the reply.
How were these runs done?
The same way for every model: each prompt sent through llmwise's own pipeline, each reply checked the same way. The methods page has every prompt and how each is scored.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.
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