Home / Compare / Claude Opus 5.5 vs Kimi K3 Claude Opus 5.5 vs Kimi K3 Claude Opus 5.5 grades higher overall (99.5 against 88.7). Kimi K3 costs 29% less for the same work.
Model AClaude Fable 5 Claude Haiku 4.5 Claude Opus 4.7 Claude Opus 4.8 Claude Opus 5 Claude Opus 5.5 Claude Sonnet 4.6 Claude Sonnet 5 Claude Sonnet 5.5 DeepSeek R1 0528 DeepSeek V3 DeepSeek V3.1 DeepSeek V3.2 DeepSeek V4 Flash DeepSeek V4 Flash 0731 DeepSeek V4 Pro 0813 DeepSeek V4.1 Flash Gemini 2.5 Flash Gemini 2.5 Pro Gemini 3.1 Flash Lite Gemini 3.1 Pro Gemini 3.5 Flash Gemini 3.7 Flash Gemma 3 12B IT Gemma 3 27B IT Gemma 3 4B IT Gemma 4 26B A4B IT Gemma 4 31B IT GLM 4.6 GLM 4.7 GLM 5.2 GLM 5.3 GLM 5.3 Flash GPT OSS 120B GPT OSS 20B Granite 4.2 8B Hy4 Preview Inkling Small Kimi K2.6 Kimi K3 Ling 3.1 Flash Llama 3.3 70B Instruct Turbo Llama 4 Scout 17B 16E Instruct Meta Llama 3.1 70B Instruct Turbo Meta Llama 3.1 8B Instruct Turbo MiMo V2.6 Flash MiMo V2.6 Pro MiniMax M3 Mistral Small 24B Instruct 2501 Mistral Small 3.2 24B Instruct 2506 Muse Glimmer 30B NVIDIA Nemotron 3 Super 120B A12B NVIDIA Nemotron 3 Ultra 550B A55B NVIDIA Nemotron 3.5 Lightning Phi 4 Qwen2.5 72B Instruct Qwen3 235B A22B Instruct 2507 Qwen3 30B A3B Qwen3 32B Qwen3 Coder 480B A35B Instruct Turbo Qwen3 Next 80B A3B Instruct Qwen3 VL 235B A22B Instruct Qwen3.5 27B Qwen3.5 35B A3B Qwen3.5 397B A17B Qwen3.5 9B Qwen3.6 27B Qwen3.6 35B A3B Qwen3.7 Max Qwen3.8 27B Qwen3.8 Flash Qwen3.8 Max Seed 2.0 Pro Step 5 Preview Claude Opus 5.5
by Anthropic · #1 of 67 overall
Coming soon · price at launch
Context 1M
Input / 1M $4.00
Output / 1M $20.00 Model BClaude Fable 5 Claude Haiku 4.5 Claude Opus 4.7 Claude Opus 4.8 Claude Opus 5 Claude Opus 5.5 Claude Sonnet 4.6 Claude Sonnet 5 Claude Sonnet 5.5 DeepSeek R1 0528 DeepSeek V3 DeepSeek V3.1 DeepSeek V3.2 DeepSeek V4 Flash DeepSeek V4 Flash 0731 DeepSeek V4 Pro 0813 DeepSeek V4.1 Flash Gemini 2.5 Flash Gemini 2.5 Pro Gemini 3.1 Flash Lite Gemini 3.1 Pro Gemini 3.5 Flash Gemini 3.7 Flash Gemma 3 12B IT Gemma 3 27B IT Gemma 3 4B IT Gemma 4 26B A4B IT Gemma 4 31B IT GLM 4.6 GLM 4.7 GLM 5.2 GLM 5.3 GLM 5.3 Flash GPT OSS 120B GPT OSS 20B Granite 4.2 8B Hy4 Preview Inkling Small Kimi K2.6 Kimi K3 Ling 3.1 Flash Llama 3.3 70B Instruct Turbo Llama 4 Scout 17B 16E Instruct Meta Llama 3.1 70B Instruct Turbo Meta Llama 3.1 8B Instruct Turbo MiMo V2.6 Flash MiMo V2.6 Pro MiniMax M3 Mistral Small 24B Instruct 2501 Mistral Small 3.2 24B Instruct 2506 Muse Glimmer 30B NVIDIA Nemotron 3 Super 120B A12B NVIDIA Nemotron 3 Ultra 550B A55B NVIDIA Nemotron 3.5 Lightning Phi 4 Qwen2.5 72B Instruct Qwen3 235B A22B Instruct 2507 Qwen3 30B A3B Qwen3 32B Qwen3 Coder 480B A35B Instruct Turbo Qwen3 Next 80B A3B Instruct Qwen3 VL 235B A22B Instruct Qwen3.5 27B Qwen3.5 35B A3B Qwen3.5 397B A17B Qwen3.5 9B Qwen3.6 27B Qwen3.6 35B A3B Qwen3.7 Max Qwen3.8 27B Qwen3.8 Flash Qwen3.8 Max Seed 2.0 Pro Step 5 Preview Kimi K3
by Moonshot AI · #5 of 67 overall
Available
Context 1M
Input / 1M $2.85
Output / 1M $14.25 Better overall
Claude Opus 5.5
Grade 99.5 vs 88.7
Cheaper
Kimi K3
29% less, $5.70 vs $8.00 blended
Larger context
Kimi K3
1M vs 1M tokens
Head to head Public benchmarks. Longer is better; each value links to its source.
LMArena Text Elo-style rating · LMArena (CC BY 4.0) · Oct 13, 2026 SWE-Bench Pro % of tasks resolved · Scale AI SWE-Bench Pro · Sep 22, 2026 · reference Claude Opus 5.5 Claude Opus 5.5: —
Claude Opus 5.5 $1,600 /month
Kimi K3 $1,140 /month
Kimi K3 saves you $460 a month at this usage, $5,520 a year.
At a glance Attribute Claude Opus 5.5 Kimi K3 Made by Anthropic Moonshot AI Availability Coming soon Available now Overall grade Excellent · 99.5 Excellent · 88.7 Overall rank #1 of 67 #5 of 67 Input price $4.00 per 1M $2.85 per 1M Output price $20.00 per 1M $14.25 per 1M Context window 1,000,000 tokens 1,048,576 tokens Reasoning levels Yes Yes Reads images Yes Yes Model ID claude-opus-5-5 kimi-k3
Try both with one key Same endpoint, same key, both hosted in the USA. Change one word to switch models, in Claude Code, Cursor, Cline or your own code.
Get your API key # Ask either model the same thing
curl https://fullsendai.com/v1/chat/completions \
-H "Authorization: Bearer $FULLSEND_API_KEY " \
-d '{"model": "claude-opus-5-5", "messages": [...]}'
# …then swap one word
-d '{"model": "kimi-k3", "messages": [...]}' Questions Is Claude Opus 5.5 or Kimi K3 better? Claude Opus 5.5 grades 99.5 against 88.7 for Kimi K3, from public benchmarks.
Which is cheaper, Claude Opus 5.5 or Kimi K3? Kimi K3: $2.85 in and $14.25 out per million tokens, against $4.00 and $20.00 through FullsendAI.
Which has the larger context window? Kimi K3, with 1,048,576 tokens.
Can I use both with one API key? Kimi K3 is available now; the other is coming soon, at the price shown. Both will use the same FullsendAI key.
Scores: LMArena (CC BY 4.0), Scale AI SWE-Bench Pro, Terminal-Bench, and model makers’ published results where marked v. Prices are FullsendAI’s, per million tokens. Data as of Oct 28, 2026.
