Claude Instant 1.2vsClaude Mythos 5
Claude Instant 1.2 | Claude Mythos 5 | |
|---|---|---|
| Specifications | ||
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 100k | 1M |
| BenchmarksPublished by one model only | ||
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | — | 95.5% |
HumanEvalFunction synthesis — 164 small Python problems: the AI is given a function's description and has to write the working function. This was the coding benchmark of the GPT-3.5 and GPT-4 era, before the field moved to fixing real bugs in real repositories. Higher is better. | 58.7% | — |
Terminal-Bench 2.0Agentic terminal coding — Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? (Version 2.0 of the test.) Higher is better. | — | 88% |
BrowseCompWeb browsing — Can the AI browse the web and track down hard-to-find answers? Higher is better. | — | 88% |
Humanity's Last Exam · with toolsMultidisciplinary reasoning — Humanity's Last Exam — extremely hard expert questions across many subjects. “With tools” means the AI is allowed to search the web or run code while answering. Higher is better. | — | 64.5% |
GSM8KGrade-school math — Grade-school maths word problems that take a few steps of arithmetic to work through. It separated the models of 2022 and 2023 sharply, then saturated. One caveat on the historical numbers: OpenAI included part of the GSM8K training set in GPT-4's pre-training mix, so GPT-4's score is not a clean few-shot result. Higher is better. | 86.7% | — |
OSWorld-VerifiedAgentic computer use — Can the AI actually operate a computer — clicking, typing, and using real apps — to finish tasks on its own? Higher is better. | — | 85% |
| Overview | ||
| Company | Anthropic | Anthropic |
| Release date | Aug 9 2023 | Jun 9 2026 |
| Access | Proprietary | Proprietary |
Other comparisons
Claude Instant 1.2vsGPT-6 AstraClaude Mythos 5vsGPT-6 AstraClaude Instant 1.2vsGemini 3.8 FlashClaude Mythos 5vsGemini 3.8 FlashClaude Instant 1.2vsMuse Spark 1.3Claude Mythos 5vsMuse Spark 1.3Claude Instant 1.2vsGrok 4.6Claude Mythos 5vsGrok 4.6Claude Instant 1.2vsDeepSeek-V4-Pro-0813Claude Mythos 5vsDeepSeek-V4-Pro-0813Claude Instant 1.2vsMistral Medium 3.5Claude Mythos 5vsMistral Medium 3.5
Frequently asked questions
Claude Instant 1.2 and Claude Mythos 5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Instant 1.2 shipped 1035 days before Claude Mythos 5, so benchmark comparisons should account for the intervening progress.
Context windows are 100k (Claude Instant 1.2) vs 1M (Claude Mythos 5).
Direct benchmark comparisons are unavailable — Claude Instant 1.2 and Claude Mythos 5 don't publish scores on any of the same benchmarks.