LFM2.5 8B A1B vs gpt-oss-120B
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by Together
|
by Together
|
|---|---|---|
| Overview | ||
| Status | Current budget Open weights | Current budget Open weights |
| Released | May 27, 2026 | Jan 1, 2026 |
| Pricing per million tokens | ||
| Input | $0.030/Mtok | $0.150/Mtok |
| Output | $0.120/Mtok | $0.600/Mtok |
| Blended avg | $0.052/Mtok | $0.262/Mtok |
| Specifications | ||
| Context window | 33K tokens | 128K tokens |
| Parameters | 8.5B (A1B) | 120B |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
text
|
text
|
| Benchmarks sources: Artificial Analysis / Vellum LLM Leaderboard | ||
| Independent composite scores measured for both models — each on its own scale | ||
| AA-Omniscience Index (−100–100) | -33.2 | -49.2 |
| AA Intelligence Index | — | 24.1 |
| AA Agentic Index | — | 13.4 |
| Per-benchmark results published for gpt-oss-120B only — no independent per-benchmark scores exist for LFM2.5 8B A1B yet | ||
| Avg benchmark score | — | 65.5 |
| Perf / dollar | — | 249.5 |
| GPQA Diamond | — | 80.1 |
| LiveCodeBench | — | 69 |
| Humanity's Last Exam | — | 14.9 |
| AIME 2025 | — | 97.9 |
| Providers | ||
| Available from |
Together — $0.030/$0.120/Mtok
|
Together — $0.150/$0.600/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | LFM2.5 8B A1B | gpt-oss-120B | Savings |
|---|---|---|---|
| 1M tokens | $0.05 | $0.26 | $0.21 (80%) |
| 10M tokens | $0.53 | $2.62 | $2.1 (80%) |
| 100M tokens | $5.25 | $26.25 | $21 (80%) |
| 1000M tokens | $52.5 | $262.5 | $210 (80%) |
When to pick which
distilled from the pricing and spec data above- cost dominates: $0.052/Mtok blended vs $0.262 — 80% less on the same 50/50 token mix
- you need the longer context: 128K tokens vs 33K (3.9×)
The cheaper option here — LFM2.5 8B A1B costs $0.052/Mtok blended on Together.
Summary
LFM2.5 8B A1B by Together costs $0.030/Mtok input and $0.120/Mtok output, with a 33K-token context window. It supports text input.
gpt-oss-120B by Together costs $0.150/Mtok input and $0.600/Mtok output, with a 128K-token context window. It supports text input.
On a blended cost basis, LFM2.5 8B A1B is 80% cheaper than gpt-oss-120B.
The two aren't directly comparable on average benchmark score: gpt-oss-120B has published per-benchmark results, while LFM2.5 8B A1B does not yet — it is measured today on independent composites (see the table above).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.