{"schema":"postcutoff/model@1","as_of":"2026-10-25T23:49:00+01:00","url":"https://postcutoff.com/m/celeris-1/","md":"https://postcutoff.com/m/celeris-1/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"celeris-1","name":"Celeris-1","org":"Celeris","family":"Celeris-1","released":"2026-07-24","status":"current","type":"llm","modality_in":["text"],"modality_out":["text"],"open_weights":false,"model_license":"proprietary","context_window":null,"max_output":null,"knowledge_cutoff":null,"pricing":{"input":0.2,"output":0.7,"unit":"per 1M tokens (USD, input and output metered separately)","source":"https://celeris.ai/pricing.html"},"price_line":"$0.20 in, $0.70 out per 1M tokens","access":[{"provider":"Celeris API (OpenAI-compatible chat completions)","model_id":"celeris-1","endpoint":"https://inference.celeris.ai/celeris-1/v1/chat/completions","docs":"https://docs.celeris.ai/"}],"capabilities":[{"name":"Diffusion language model built for speed","detail":"Celeris describes it as 'the world's fastest language models, powered by diffusion': it 'starts with a rough representation of the response and progressively refines it into language' instead of generating one token at a time.","first":false,"discovered":"launch","source":"https://celeris.ai/"},{"name":"#1 output speed on Artificial Analysis","detail":"Celeris reported 2,038 output tokens/s on Artificial Analysis (Aug 4, 2026 X post, ~2.3M views); RuntimeWire later cited 2,157.9 tok/s and 0.64 s TTFT; AA's model page showed 1,605 tok/s, #1 of 59, on 2026-10-25. Figures differ by snapshot.","first":false,"discovered":"later","source":"https://artificialanalysis.ai/models/celeris-1"},{"name":"158 ms complete answers","detail":"Vendor benchmark: 75.9% on MMLU-Pro (5-shot CoT) at 158 ms p50 server-reported latency with reasoning budget 0 (up to 81.4% with reasoning enabled, per homepage), vs Inception Mercury 2 at 63.7% / 257 ms.","first":false,"discovered":"launch","source":"https://celeris.ai/blog-benchmarks"}],"entry":null,"notes":"Made by Celeris (Celeris Labs), led by Marqo co-founders Tom Hamer and Jesse Clark (RuntimeWire, press summaries); company site celeris.ai. Release date 2026-07-24 per Artificial Analysis and launch coverage (BenchLM says Jul 22; not settled). Artificial Analysis (read 2026-10-25, https://artificialanalysis.ai/models/celeris-1): #1 of 59 non-reasoning models on output speed (1,605.4 tok/s, TTFT 0.56 s), Intelligence Index 6 (#58 of 71) — far below frontier models; AA lists $0.20/$0.70 and a ~131k context window, but Celeris's own docs give no context window or max output, so those fields are left out (one press summary said 8,192). Some third-party listings show older $2/$6 pricing; the Celeris pricing page shows $0.20/$0.70. Image input is listed by AA but not documented by Celeris, so modality_in is text only. Sibling products: Celeris-1 Decision (Oct 8, 2026; decision/scoring model, $0.04 per 1M input, output free) and Celeris-1 Magnus (named in navigation, no details). No timeline entry yet.","verified":"2026-10-25","body_md":"Celeris-1 is a proprietary diffusion LLM aimed at latency-critical uses (voice agents, coding tools, agent loops) where speed matters more than peak intelligence. Comparable to Inception's Mercury line.\n\n```bash\ncurl https://inference.celeris.ai/celeris-1/v1/chat/completions -H \"Authorization: Bearer $CELERIS_API_KEY\" \\\n  -H \"Content-Type: application/json\" -d '{\"model\":\"celeris-1\",\"messages\":[{\"role\":\"user\",\"content\":\"Hi\"}],\"max_tokens\":256}'\n```\n\nSources: [Celeris](https://celeris.ai/) · [Pricing](https://celeris.ai/pricing.html) · [Docs](https://docs.celeris.ai/) ·\n[Benchmarks blog](https://celeris.ai/blog-benchmarks) · [Artificial Analysis](https://artificialanalysis.ai/models/celeris-1) ·\n[RuntimeWire](https://runtimewire.com/article/celeris-1-tops-ai-speed-ranking-diffusion-model) ·\n[Celeris on X (Aug 4, 2026)](https://x.com/Celeris_ai/status/2084429307422872026)","page_url":"https://postcutoff.com/m/celeris-1/","events_after":null,"major_after":null,"historic_after":null,"missing_at_launch":null,"events_since_release":1209,"you_url":"https://postcutoff.com/you/celeris-1/","briefings":null}