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Best-AI.org
The Briefing
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● INSIDE THREE DATES that can break a build, one price that did not rise, and a 15-minute search of your own code.
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The cold open
The price rise that did not happen. The shutdown that did.
In July we wrote that Sonnet 5 launched at $2 input and $10 output per million tokens through August 31. On August 10 Anthropic said the rise to $3 and $15, due on September 1, will not happen.
Sixteen days later OpenAI switched off the Assistants API on August 26. A price notice can be undone by the vendor. A shutdown cannot be undone by you.
This issue is about telling the two apart, and about the one date in August that is still ahead of you.
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The signals
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| 01 |
Sonnet 5 stays at $2 and $10. Anthropic cancelled the September 1 increase on August 10. |
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The Assistants API is gone. OpenAI shut it down on August 26. The replacement is the Responses and Conversations APIs. |
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Gemini 3.7 Flash is generally available. Google released it on August 13 at an introductory price that runs through December 31. |
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IF YOU DO ONE THING →
Search your code for the Assistants API and for whisper-1. One of them has a date on it that is not August.
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| 01 |
Anthropic
A price rise was cancelled, and a model was retired
On August 10 Anthropic announced that Claude Sonnet 5 stays at $2 input and $10 output per million tokens. The scheduled increase to $3 and $15 on September 1 will not happen. Five days earlier, on August 5, Claude Opus 4.1 was retired and now returns an error; the release notes point to Claude Opus 5.
Agent tooling also left beta that month. On August 19 the computer use tool became computer_toolset_20260801, the browser use tool launched as browser_toolset_20260801, and the Files API and Agent Skills left beta.
THE TAKE
A promotional price is a loan, not a list price. Plan your cost model on the number a vendor commits to after the promotion, and treat any cancellation as a bonus. The retirement is the opposite signal: a model that stops answering does not offer a vote.
SOURCE Anthropic, API release notes
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| 02 |
OpenAI
The Assistants API shut down, and the speed tiers got faster on paper
OpenAI shut down the Assistants API on August 26. The migration path is the Responses and Conversations APIs. The same day it announced that whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe and gpt-4o-transcribe-diarize shut down on February 26, 2027, with gpt-live-transcribe and gpt-transcribe as the way forward.
On August 21 OpenAI cut the price of GPT-5.6 Sol; the changelog says the promotional price lasts at least through November 21. On August 13 it announced ultrafast mode, a GPT-5.6 Sol service tier up to 14 times faster than Standard, in limited preview.
THE TAKE
The transcription date is the one to write down today. It is six months out, which is exactly far enough that nobody will own it in February. Do not roadmap ultrafast mode; it is in limited preview.
SOURCE OpenAI, API changelog
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Google
Gemini 3.7 Flash reaches general availability
Google released gemini-3.7-flash as generally available on August 13, at an introductory price that runs through December 31. The changelog does not print the price, so read it on the pricing page before you plan around it. On August 26 gemini-3.5-transcribe and its live variant followed, and on August 27 gemini-omni-1.1-flash reached GA with video extension and a resolution parameter up to 4k.
Google also shut down gemini-robotics-er-1.6-preview on August 31, a date announced on July 30.
THE TAKE
An introductory price with an end date is a decision with a deadline. Put December 31 in the same calendar as your other renewals, and decide now what you will do on January 1.
SOURCE Google, Gemini API changelog
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Hype check |
OUR OPINION, LOUDLY |
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Underrated
The cancelled Sonnet 5 price rise
The quiet change of the month. It protects every budget that was built on $2 and $10, and it was one line in the release notes.
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Overrated
Ultrafast mode "up to 14x faster"
A limited preview is a press release with a waitlist. Come back when there is a price and a region list.
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Rated correctly
The Assistants API shutdown
A shutdown, not a launch. Nothing to cheer, and the only item this month that breaks code.
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Receipts |
GRADING OUR OWN HOMEWORK |
"Sonnet 5 launches at $2 input and $10 output per million tokens through August 31."
US, TLDR POINT 03, DEVELOPER BRIEFING JULY 2026
We wrote the end date down; Anthropic then removed it. The $3 and $15 increase scheduled for September 1 was cancelled on August 10. Verdict: right on the launch price, wrong on the end date, in the reader's favour. We should have said the end date was Anthropic's to move.
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The number
22 days
Between Anthropic cancelling the Sonnet 5 price increase on August 10 and the date it was due, September 1. A price notice that ran in the buyer's favour.
SOURCE Anthropic, API release notes
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One thing to try
The date search, 15 minutes
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Search your repositories for beta.assistants, assistants.create and whisper-1. |
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For each hit, write down the owner and the file. The Assistants API is already off, so those hits are bugs today. |
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Put February 26, 2027 in a calendar for the transcription models, with the replacement named in the entry. |
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Do the same for any model name that appears in more than one file. One config file, one owner. |
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If you read one thing
Anthropic release notes, August 19
The computer use and browser use tools are out of beta under new names. If you pinned the old beta headers, check them before your next SDK upgrade.
READ THE RELEASE NOTES →
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Built something worth finding?
Submit it for free review. Add our badge with a normal followed link and we gift you Fast-Track: a decision within 48 hours after we confirm the link.
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That is August. Go and find the word "assistants" in your own code.
Think we called one wrong? Excellent. Reply and tell us which, with a source. We will grade ourselves in public.
THE BRIEFING / AUGUST 2026 / BEST-AI.ORG
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