Claude Opus 4.6vsGrok 4.20 Beta
Claude Opus 4.6 | Grok 4.20 Beta | |
|---|---|---|
| API pricingUSD per 1M tokens · lower wins · base tier | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | $5.00 | $1.25 |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | $25.00 | $2.50 |
Cached input priceA reduced rate for text you send over and over. If every request starts with the same instructions or the same document, the provider keeps a copy ready and charges less to read it again. | $0.50 | $0.20 |
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $5.00Amazon Bedrock | — |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | $25.00Amazon Bedrock | — |
| Benchmarks | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 87% | 56% |
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. | 80.8% | 76.7% |
| BenchmarksPublished by one model only | ||
ProgramBenchProgram reconstruction — The AI receives a working program and its documentation, then builds a replacement from scratch without the original source code, internet access or decompilation. The score is the percentage of 200 programs that pass every behavioral test. We record each model's best published mini-SWE-agent result, including higher reasoning efforts where available. Partial test-pass rates and almost-solved programs do not count toward this score. Equal scores share a rank here; the official board also uses partial progress to break ties. Higher is better. | 0% | — |
Next.js EvalsNext.js coding — Vercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 58% | — |
BrowseCompWeb browsing — Can the AI browse the web and track down hard-to-find answers? Higher is better. | 83.7% | — |
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. | 53% | — |
ARC-AGI-2Abstract reasoning — Puzzle-style tests of abstract reasoning and pattern-finding — the kind of thing people find easy but AIs often struggle with. Higher is better. | — | 53.3% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 91.3% | — |
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. | 72.7% | — |
| Overview | ||
| Company | Anthropic | SpaceXAI |
| Release date | Feb 5 2026 | Feb 17 2026 |
| Access | Proprietary | Proprietary |
Other comparisons
Claude Opus 4.6vsGPT-6 AstraGrok 4.20 BetavsGPT-6 AstraClaude Opus 4.6vsGemini 3.8 FlashGrok 4.20 BetavsGemini 3.8 FlashClaude Opus 4.6vsMuse Spark 1.3Grok 4.20 BetavsMuse Spark 1.3Claude Opus 4.6vsDeepSeek-V4.1-FlashGrok 4.20 BetavsDeepSeek-V4.1-FlashClaude Opus 4.6vsMistral Medium 3.5Grok 4.20 BetavsMistral Medium 3.5Claude Opus 4.6vsKimi K3Grok 4.20 BetavsKimi K3
Frequently asked questions
Claude Opus 4.6 leads Grok 4.20 Beta on 2 of the 2 benchmarks they both report (BullshitBench v2, SWE-Bench Verified). Grok 4.20 Beta is cheaper on both input and output: $1.25 vs $5.00 per million input tokens, and $2.50 vs $25.00 per million output tokens. Figures are base-tier rates. Claude Opus 4.6 shipped 12 days before Grok 4.20 Beta, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
On BullshitBench v2, Claude Opus 4.6 leads at 87% vs Grok 4.20 Beta at 56%. On SWE-Bench Verified, Claude Opus 4.6 leads at 80.8% vs Grok 4.20 Beta at 76.7%.