Alternatives?
CheaperClaude Opus 5.5highwins 96%-10%$1.82No forced tool use+5
BetterGPT-6 Lunahighwins 59%-99%$0.029Function calling only with none · Chat Completions+3
OpenQwen3.8 Flashthinkingwins 93%-82%$0.37Context: 1M → 262K+6CheaperClaude Sonnet 5.5highwins 95%-56%$0.88No forced tool use+5
CheaperMuse Spark 1.3maxwins 93%-21%$1.60Only auto tool_choice is supported+5Claude Opus 5.5highwins 96%-10%$1.82No forced tool use+5Claude Sonnet 5.5highwins 95%-56%$0.88No forced tool use+5Muse Spark 1.3maxwins 93%-21%$1.60Only auto tool_choice is supported+5Qwen3.8 FlashthinkingOpenwins 93%-82%$0.37Context: 1M → 262K+6Claude Haiku 5.5maxwins 93%-89%$0.21Remove sampling parameters+5GPT-6 Lunahighwins 59%-99%$0.029Function calling only with none · Chat Completions+3GPT-5.6 Lunahighwins 57%-98%$0.044Claude Haiku 5.5mediumwins 81%-98%$0.047Remove sampling parameters+5
MiMo v2.6 FlashthinkingOpenwins 89%-97%$0.062Pass back reasoning_content+3MiMo v2.6 ProthinkingOpenwins 91%-93%$0.13Pass back reasoning_content+3Qwen3.8 FlashthinkingOpenwins 93%-82%$0.37Context: 1M → 262K+6
DeepSeek V4.1 Flash 1017maxOpenwins 93%-87%$0.26Pass back reasoning_content · Chat Completions+4MiMo v2.6 ProthinkingOpenwins 91%-93%$0.13Pass back reasoning_content+3
GLM 5.3maxOpenwins 90%same$2.01Reasoning cannot be disabled+3
Kimi K3maxOpenwins 90%same$2.00Sampling parameters are fixed+3Benchmarks
in Agents & Tool UseFAQ
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 GPT-5.5?›
On AA-Briefcase 1.1 · Elo, Quasar 438B scores 1,122.9 vs 1,136.3 — about the same. It is 23% cheaper 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 Qwen3.8 Flash.
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-6 Luna (better), Qwen3.8 Flash (open weights).