Ranking?
Alternatives?
CheaperClaude Opus 5.5high×3-10%$1.82No forced tool use+5
BetterGPT-5.6 Lunamedium+38%-99%$0.016
OpenMiMo v2.6 Prothinking×2.6-93%$0.13Pass back reasoning_content+3CheaperGPT-6 Astrahigh×2.8-15%$1.73Monitoring can return HTTP 403+2CheaperGPT-6.1 Solmax×2.8-64%$0.72Remove unsupported parameters+5Claude Opus 5.5high×3-10%$1.82No forced tool use+5GPT-6 Astrahigh×2.8-15%$1.73Monitoring can return HTTP 403+2GPT-6.1 Solmax×2.8-64%$0.72Remove unsupported parameters+5MiMo v2.6 ProthinkingOpen×2.6-93%$0.13Pass back reasoning_content+3
Muse Spark 1.3max×2.6-21%$1.60Only auto tool_choice is supported+5GPT-5.6 Lunamedium+38%-99%$0.016GPT-6 Lunamedium+51%-99%$0.017Function calling only with none · Chat Completions+3MiMo v2.5thinkingOpen+46%-99%$0.019Claude Haiku 5.5low+45%-99%$0.024Remove sampling parameters+5GPT-5 Minihigh+15%-97%$0.053Context: 1M → 400KMiMo v2.6 ProthinkingOpen×2.6-93%$0.13Pass back reasoning_content+3
Kimi K3maxOpen×2.5same$2.00Sampling parameters are fixed+3
Step 5 PreviewthinkingOpen×2.5-49%$1.03web_search not available · Chat Completions+2Muse Spark OpenxhighOpen×2.3-58%$0.84Reasoning off leaves output unchanged · Self-hosted / llama.cpp+1
DeepSeek V4.1 Flash 1017maxOpen×2.3-87%$0.26Pass back reasoning_content · Chat Completions+4Benchmarks
all categoriesFAQ
How much does Quasar 438B cost?›
$0.60 per 1M input tokens and $1.80 per 1M output tokens. A typical benchmark task costs about $2.02 at max effort.
Is Quasar 438B free to use?›
There is no free API; the cheapest paid price is $0.60 per 1M input tokens.
How good is Quasar 438B, and what is it best at?›
#129 of 334 in Chat & Knowledge, #54 of 132 in Coding, #55 of 133 in Agents & Tool Use, #81 of 133 in Vision & Documents. Strongest at: Knowledge.
Is Quasar 438B better than Gemini 3.5 Flash Lite?›
On Humanity's Last Exam, Quasar 438B scores 18.7 vs 18.8 — about the same. It is 950% more expensive per task.
How can I use Quasar 438B?›
Through the API of Multiverse Computing.
What is the context window of Quasar 438B?›
1M tokens.
When was Quasar 438B released? Is there a newer version?›
Released 2026-08-10. It is the current version in its line.
Is Quasar 438B open source?›
No, Quasar 438B is a closed model available through an API. The closest open-weights option here is MiMo v2.6 Pro.
Can Quasar 438B read images?›
No, it accepts text only.
What is Quasar 438B?›
Quasar 438B is a closed language model from Multiverse Computing, released Aug 2026.
What are the best alternatives to Quasar 438B?›
Claude Opus 5.5 (cheaper), GPT-5.6 Luna (better), MiMo v2.6 Pro (open weights).