What Is a Context Window? Token Limits by Model (2026)

A context window is the token budget for one request, input plus output. One identical document measured across 9 models: 614 to 957 tokens, a 1.56x spread.

Best AI Coding Agent Harness (2026): 9 Tools + Model Pairing

OpenRouter usage data across 9 harnesses. Claude Code users run GLM 5.2 more than every Claude model combined. Pick the tool, then pick the model.

429 Too Many Requests: What It Means, When to Retry (2026)

A 429 is one status code for 5 different problems. Read retry-after first, back off 1s/2s/4s with jitter, and skip the retry entirely on billing 429s.

Is Seedance 2.0 Free? 6 Access Routes and Costs (2026)

No free Seedance 2.0 API tier exists. BytePlus wants $29.70 prepaid before your first call, a 4s test clip is $0.16, and 1 of 6 routes is genuinely free.

DeepSeek V4 Flash: 6 Ways to Pay Less as Prices Rise (2026)

DeepSeek API prices rise soon. Cache hits cost 50x less, host cache rates vary 28x, the obvious slug buys the old 0423 build. 6 fixes + break-even math.

How to Use Seedance 2.0 (2026): Prompts, 6 Fixes, and Cost

Seedance 2.0 clips drifting or sprouting subtitles? ByteDance's own prompt spec, 6 documented fixes, and 720p at $0.16/s through one ofox key.

Qwen 3.8 Max vs DeepSeek V4 Flash 2026: 3 Points, 345x Bill

Qwen 3.8 Max scores 53 on AA vs DeepSeek V4 Flash's 50. On 3 measured tasks it cost 345x more and ran 6x slower. When those 3 points are worth it.

Qwen 3.7 Max vs Kimi K3 vs DeepSeek V4: 34x Cost Gap (2026)

Same eval suite, same methodology: Kimi K3 scores 57 and costs $2,437 to run it. DeepSeek V4 Flash scores 50 and costs $72. Qwen 3.7 Max scores 46 for $1,604.

Qwen 3.8 Max: Price, API Access, and Open Weights (2026)

Qwen 3.8 Max shipped Aug 3, 2026: $2/$6 per 1M tokens, 1M context, 131K output, open weights next week. Live on ofox as bailian/qwen3.8-max.

Best LLM API Providers 2026: 4 Types and What Each Costs

Four ways to buy the same tokens. Claude Opus 5 is $5/$25 on three of them, gpt-oss-120B runs $0.15/M, top-up fees hit 5.5%, regional endpoints add 10%.