OpenAI releases 372 proofs, Chrome adds JPEG XL, and Anthropic cuts Claude Haiku costs

In this issue

Lean verification of AI autoformalisation does not guarantee correct natural language proofs
OpenAI releases 372 mathematical proofs, including a solution to the Unique Games Conjecture
Chrome 155 adds JPEG XL decoding support
Anthropic releases Claude Haiku 5.5 with significant cost reductions
ShinyHunters extortion of Boeing spin-off precedes suspect's detention
PSP games run in browsers via static recompilation to WebAssembly
and 4 more in brief

Top stories

Lean verification of AI autoformalisation does not guarantee correct natural language proofs

A new paper argues that verifying AI-generated mathematical proofs in Lean does not ensure the original natural language arguments are correct. The authors explain that translating natural language into a formal language like Lean is semantically difficult, often requiring the resolution of ambiguities that sit high in the Solvability Complexity Index hierarchy. They demonstrate this with examples of AI mistranslations, including OpenAI’s announced Navier-Stokes proof, where the formalized Lean proof did not correspond to the natural language proof of solution blow-up.

arxiv.org HN discussion

OpenAI releases 372 mathematical proofs, including a solution to the Unique Games Conjecture

OpenAI released 372 major mathematical results on October 7, 2026, including a proof of the Unique Games Conjecture. This conjecture, which implies NP-hardness for various optimization problems, was a central research goal for Subhash Khot. While a Lean certificate exists for the UGC proof, the author notes that no human has yet fully understood the derivations. The article describes an ongoing effort by researchers to verify and interpret these AI-generated solutions, highlighting the current gap between automated proof generation and human comprehension.

scottaaronson.blog HN discussion

Chrome 155 adds JPEG XL decoding support

Chrome is shipping decoding support for the JPEG XL image format starting with version 155. The team highlights that JPEG XL offers 30-50% better compression than JPEG, along with built-in HDR support and lossless JPEG transcoding. To ensure memory safety, the decoder was reimplemented in Rust using a SIMD abstraction layer. The Chrome team notes that this decision was driven by consistent feedback from web developers, particularly through the Interop Process, and encourages developers to begin using .jxl images in their pipelines.

developer.chrome.com HN discussion

Anthropic releases Claude Haiku 5.5 with significant cost reductions

Anthropic has launched Claude Haiku 5.5, its fastest and most capable small model to date. Designed for high-volume, cost-sensitive tasks like summarization and subagent work, the model offers substantial price cuts. On average, it costs around 75% less to run than its predecessor. Additionally, Anthropic is halving the price of cache reads for Sonnet 5.5 and introducing new monthly API credits for Max and Team subscribers.

anthropic.com HN discussion

ShinyHunters extortion of Boeing spin-off precedes suspect's detention

KrebsOnSecurity reports that ShinyHunters was actively extorting Jeppesen ForeFlight, a business unit recently divested by Boeing, when its suspected leader was detained. The suspect, a teenager from Amman, Jordan using the handle “Rey,” was reportedly cooperating with the FBI to identify other gang members. Sources indicate the group allegedly stole sensitive information from the former Boeing unit that could pose operational safety risks. Boeing stated that its investigation found no impact to its operations or products, while the FBI investigation gained urgency following the attempted extortion.

krebsonsecurity.com HN discussion

PSP games run in browsers via static recompilation to WebAssembly

A new project enables PSP games to run directly in web browsers without traditional emulation. It achieves this by statically recompiling MIPS machine code into C++, which is then compiled to WebAssembly. The system includes a high-level emulation kernel and a WebGL2 renderer. God of War: Chains of Olympus is the first title supported, playing at 60 frames per second in Chrome and Firefox. The repository contains no game data; users must provide their own disc images to generate the web page locally.

github.com HN discussion

In brief

Margaret Hamilton, Apollo software pioneer, dies at 90. Margaret Hamilton, who led the software engineering team for NASA’s Apollo program at MIT, has died at age 90. She helped establish software engineering as a dedicated discipline and authored over 130 publications.

news.mit.edu HN discussion

LLMs compress output by up to 49% using telegraph-style instructions. Instructing models to answer in cablese reduces billed output tokens by 40–49% on API meters. Models across four families still recover information at full fidelity from these compressed records, according to the Telegraph Test benchmark.

fiveminutesforward.com HN discussion

Experimental Rust port of TypeScript 7 compiler released. An experimental Rust port of the TypeScript 7 compiler, tsc, is now available. The project claims 100% compatibility in real-world projects and runs as a drop-in replacement for most apps. It supports Linux x64 and macOS arm64, with Windows and Linux arm64 not yet supported.

github.com HN discussion

Reverse engineering of the M-Vave FM-1 firmware identifies JieLi hardware and maps update protocols. A GitHub repository documents the reverse engineering of the M-Vave FM-1 pocket synthesizer firmware. The analysis identifies the target as JieLi hardware, maps the boot chain and memory layout, and details the USB-MIDI update protocol. The project explicitly notes that the update path is not a demonstrated recovery mechanism.

github.com HN discussion