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What the checking found this month
Four things below. Two are corrections to pages on this site. Two are things most of the internet still has wrong. All four were found by opening a page, reading the vendor's current documentation next to it, and noticing they no longer agreed.
Claude Sonnet 5.5 had already shipped while this page said it had not
This page said Anthropic had announced Sonnet 5.5 on 22 September with no price, model ID or date published, and that it had not shipped. It shipped on 28 September 2026 as claude-sonnet-5-5 at $2/$10 per MTok, the same rate as Sonnet 5. The page was last verified on 25 September, three days before the release, so the statement was true when written and wrong by the time anyone read it. Haiku 5.5, announced in the same breath, genuinely has not shipped. A dated "as of" line is not a substitute for re-checking the vendor's newsroom.
Read the corrected page →GPT-6 has four shipping models, not three
The lineup section said GPT-6 has three tiers, Astra, Sol and Luna. GPT-6.1 Sol shipped on 29 September 2026 at DevDay. It is a point upgrade to Sol rather than a fourth tier, but it has its own model ID and its own price row, and its cached input is half Sol's at $0.10 per MTok. The headline $2/$10 rate did not change, which is why this one is easy to miss: the number that moved is the one that dominates prompt-heavy bills.
Read the corrected page →Gemini 4 Argon is announced, and still not something you can call
Argon was announced on 30 September 2026 and several write-ups read as though it were available. It is not. It is going first to vetted cyber defenders through the Fairwind Program, without cyber guardrails for them and Google's internal teams, and general access starts later with paid API customers and AI Ultra subscribers. Gemini 3.8 Flash is still the model to build on. The detail worth keeping: Argon's million-token limit is on output, not input, which is the first time that ceiling has moved from 64K.
Read the corrected page →DeepSeek V4-Pro was never being folded into the new Flash model
Early reports of DeepSeek's September release said V4-Pro requests would be routed to the new V4.1-Flash. We repeated that. DeepSeek's own changelog says the opposite: V4-Pro stays, at unchanged prices. It was the old V4-Flash names that got rerouted. The claim came from a secondary source, and the primary one was a single click away.
Read the corrected page →529 of the 1827 pages here carry a last_verified date, and it is on the page itself, not in a changelog. If a claim matters to a decision you are making, check when it was last confirmed - and if it is stale, that is visible rather than hidden.
Where things stand
The current flagships, and what their spec sheets leave out
Context windows and prices are easy to find anywhere. The last column is the part that takes reading the release notes - and the part that changes what you should actually do.
| Model | Released | Context | $/MTok in / out | What the specs leave out |
|---|---|---|---|---|
| GPT-6 Astra | 3 Sep 2026 | 1,050,000 | $10 / $50 | The first model a lab has classified as crossing its own "Critical" cyber threshold. Prompts over 272k tokens bill at 2x input, 1.5x output. |
| Claude Fable 5.1 | 1 Sep 2026 | 1,000,000 | $10 / $50 | New tokenizer: roughly 30% more tokens for the same text, so 1M tokens is about 555,000 words, not 750,000. Since 22 September, Opus 5.5 claims roughly Fable-level results at $4 / $20. |
| Muse Spark 1.3 | 2 Sep 2026 | 1,000,000 | $1.25 / $4.25 | Meta's flagship, and not a Llama. Closed weights. A separate Contributor endpoint drops to $0.10 / $0.20 if you let Meta train on your prompts. |
| Nova 2 Lite | 2 Dec 2025 | 1,000,000 | $0.30 / $2.50 | The only generally available model in the Nova 2 family. Pro and Omni are still preview. That price is US East with global cross-region routing; geo routing costs 10% more, and Frankfurt about 30% more. |
| Mistral Large 3 | 2 Dec 2025 | 256,000 | $0.50 / $1.50 | The cheapest frontier-class option here, and the only one whose weights you can download - Apache 2.0, including the flagship. Smallest context window of the five. |
Prices are list rates and move often; every figure is dated on its source page. Full lineups for every vendor, including the open-weight and Chinese labs, in the 2026 LLM landscape.
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