Alternatives · 2026
Best Claude Opus 4.5 alternatives in 2026
Claude Opus 4.5 starts at $25/mo, and the crowd's most-cited drawback is "200K context window only (64K max output), far behind the 1M of Gemini 3 Pro and later Claude models; users…". Below are the 10 best alternatives of 2026, ranked by real community votes.
From $25/moRead the full Claude Opus 4.5 review
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- Compare: Claude Opus 4.5 vs Claude Haiku 4.51Claude Haiku 4.5Visit
Anthropic's fastest model: about 90% of Sonnet 4.5's coding skill at $1/$5 per 1M tokens, 200K context.
$5/1M out67%(2) - Compare: Claude Opus 4.5 vs Claude Opus 4.72Claude Opus 4.7Visit
Anthropic's April 2026 Opus: 87.6% SWE-bench Verified, 1M context, high-res vision, now behind Opus 4.8
$25/1M out57%(3) - Compare: Claude Opus 4.5 vs Claude Opus 4.83Claude Opus 4.8Visit
Anthropic's flagship Opus-tier model for long-horizon agentic coding; 1M context at $5/$25 per 1M tokens.
$25/1M out57%(3) - Compare: Claude Opus 4.5 vs Claude Sonnet 54Claude Sonnet 5Visit
Anthropic's most agentic Sonnet: near Opus 4.8 quality on coding and agents at $3/$15 with 1M context
$15/1M out ($10 intro until 2026-08-31)57%(3) - Compare: Claude Opus 4.5 vs GPT-5.55GPT-5.5Visit
OpenAI's agentic flagship: 1M context, SOTA ARC-AGI-2 and Terminal-Bench 2.0, $5/$30 per 1M tokens.
$30/1M out57%(3) - Compare: Claude Opus 4.5 vs Gemini 3 Pro6Gemini 3 ProVisit
Google's Nov 2025 frontier model: 1M context, first past 1500 Elo on LMArena, replaced by Gemini 3.1 Pro.
$12/1M out (prompts ≤200K)57%(3) - Compare: Claude Opus 4.5 vs DeepSeek-V47DeepSeek-V4Visit
Open-weights 1.6T MoE with 1M-token context and near-frontier agentic coding at $0.87 per 1M output tokens
$0.87/1M out57%(3) - Compare: Claude Opus 4.5 vs Claude Opus 4.68Claude Opus 4.6Visit
Anthropic's Feb 2026 Opus: 1M context, adaptive thinking, 80.8% SWE-bench, now superseded by Opus 4.8.
$25/1M out - Compare: Claude Opus 4.5 vs GPT-5.29GPT-5.2Visit
OpenAI's Dec 2025 frontier model: 400K context, 80% SWE-bench Verified, strong reasoning but slow output.
$14/1M out50%(2) - Compare: Claude Opus 4.5 vs Gemini 3.5 Flash10Gemini 3.5 FlashVisit
Google's speed-tier flagship: beats Gemini 3.1 Pro on agentic coding at $1.50/$9, 3x pricier than 3 Flash
$9.00/1M out
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