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OKI Common Lisp (development codename Tachyon Common Lisp) is an implementation of Common Lisp by OKI Electric Industry.

It was six times faster as an interpreter and twice as fast as a compiler than Lucid Common Lisp, which was the fastest at the time(1992), and in some benchmarks was faster than optimized C code on the same machine. It was named Tachyon Common Lisp (development code name) by the developers to mean faster than C (the speed of light in physics). .

Language Specification
CLtL2 compliant at the beginning of development, later made compliant with ANSI standards.

The OKI station 7300 was also used as the initial operating platform, later ported to machines with SPARC and PA-RISC.