Bitcoin fell nearly 3% on Thursday, dropping below $82,000 after a failed attempt to break higher near $85,000. The correction followed Tesla’s third-quarter earnings report, which revealed revenue of $28.05 billion, slightly missing Bloomberg’s estimate of $28.13 billion. More significantly, Tesla’s capital expenditure came in at $4.73 billion, well below the projected $7.96 billion. This lower-than-expected spending fueled concerns about the artificial intelligence sector, contributing to broader market weakness.

Tesla CEO Elon Musk addressed the shortfall during an earnings call, stating that capital expenditures would rise through 2028 and become "noticeable in the tens of billions" by then. Ryan Lee, senior vice president at Direxion, noted that the reduced capex suggested a less aggressive approach to the AI arms race than anticipated. The negative sentiment extended to traditional markets, with South Korea’s tech-heavy KOSPI Composite Index falling 3.52% on Thursday. The index had previously dropped to 5,460 points last week, its lowest level since late July.

On-chain data indicated increased vulnerability prior to the reversal. Open interest across crypto trading platforms reached $55.95 billion late Tuesday, according to CoinGlass, marking the highest tally since September 25. Such elevated open interest can exacerbate price swings through long or short cascades. Technical analysis showed Bitcoin rejecting a downward-sloping trend line on three-day charts, maintaining a pattern of lower highs. Analysts identified the $80,000 to $81,500 range as key support, citing it as the cost basis for US spot Bitcoin exchange-traded funds.